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Urābī Pashaʿ
▪ Egyptian nationalist ʿUrābī also spelled  Arabi , in full  Aḥmad ʿUrābī Pasha al-Miṣrī  born 1839, near Al-Zaqāzīq, Egypt died , Sept. 21, 1911, ...
uracil
/yoor"euh sil/, n. Biochem. a pyrimidine base, C4H4N2O2, that is one of the fundamental components of RNA, in which it forms base pairs with adenine. Symbol: U [1905-10; UR-1 + ...
uraemia
—uraemic, adj. /yoo ree"mee euh/, n. Pathol. uremia. * * *
uraeus
/yoo ree"euhs/, n., pl. uraeuses. the sacred asp as represented upon the headdress of divinities and royal personages of ancient Egypt, usually directly over the forehead, as an ...
Uragami Gyokudō
▪ Japanese artist also called  Hyōuemon Gyokudō   born 1745, Bizen, Japan died October 10, 1820, Kyōto  Japanese painter and musician who excelled in depicting scenes of ...
Uraha Hill
▪ anthropological and archaeological site, Malawi       a paleoanthropological site in northern Malawi (Malaŵi) known for the discovery of a jawbone of an ancient human ...
Ural
/yoor"euhl/, n. 1. a river in the Russian Federation, flowing S from the S Ural Mountains to the Caspian Sea. 1575 mi. (2535 km) long. 2. a former administrative division ...
Ural Mountains
a mountain range in the W Russian Federation, extending N and S from the Arctic Ocean to near the Caspian Sea, forming a natural boundary between Europe and Asia. Highest peak, ...
Ural River
Ural River river flowing from the S section of the Urals into the N end of the Caspian Sea: 1,575 mi (2,535 km) * * * River, Russia and Kazakhstan. Rising at the southern end ...
Ural-Altaic
/yoor"euhl al tay"ik/, adj. 1. of or pertaining to the Ural Mountains, on the border between the Russian Federation in Europe and Siberia, and the Altai Mountains, in S Siberia ...
Ural-Altaic languages
      hypothetical language grouping that includes all the languages of the Uralic and Altaic language families. Most of the evidence for including the Uralic and Altaic ...
Uralian
/yoo ray"lee euhn, -rayl"yeuhn/, adj. 1. of or pertaining to the Ural Mountains or their inhabitants. 2. Uralic. [1790-1800; URAL + -IAN] * * *
Uralian emerald
demantoid: not a true emerald. * * *       yellowish green or emerald-green andradite, a variety of garnet, not emerald. See andradite. * * *
Uralian orogenic belt
▪ geological formation       a 3,500-kilometre- (2,175-mile-) long elongate mountain system that extends from the Aral Sea to the islands of Novaya Zemlya. It is 500 km ...
Uralic
/yoo ral"ik/, n. 1. a family of languages that comprises Finno-Ugric and Samoyed as subfamilies. Hungarian, Finnish, and Estonian belong to Uralic. adj. 2. Also, Uralian. of or ...
Uralic languages
Family of more than 30 languages spoken by some 25 million people in central and northern Eurasia. A primary division is between the Finno-Ugric languages, which account for ...
Uralic-Yukaghir
U·ral·ic-Yu·ka·ghir (yo͝o-rălʹĭk-yo͞oʹkə-gîr') n. A proposed language family containing the Uralic languages and Yukaghir. * * *
uralite
—uralitic /yoor'euh lit"ik/, adj. /yoor"euh luyt'/, n. Mineral. a fibrous, dark-green hornblende formed by the hydrothermal alteration of pyroxene. [1825-35; < G Uralit, named ...
UralMountains
U·ral Mountains (yo͝orʹəl) A range of western Russia forming the traditional boundary between Europe and Asia and extending about 2,414 km (1,500 mi) from the Arctic Ocean ...
UralRiver
Ural River A river of western Russia and western Kazakhstan rising in the southern Ural Mountains and flowing about 2,533 km (1,574 mi) south, west, and south to the Caspian ...
Uralsk
/yoo ralsk"/; Russ. /ooh rddahlsk"/, n. a city in W Kazakhstan, on the Ural River. 201,000. * * *
uran
/yoo ran"/, n. monitor (def. 13). [ < F ouran, varan < Ar waran] * * *
uran-
uran- pref. Variant of urano-. * * *
urania
/yoo ray"nee euh, -rayn"yeuh/, n. Chem. See uranium dioxide. [URANI(UM) + -A4] * * * ▪ Greek Muse Greek“Heavenly”       in Greek religion, one of the nine Muses, ...
Urania
/yoo ray"nee euh, -rayn"yeuh/, n. Class. Myth. the Muse of astronomy. * * * ▪ Greek Muse Greek“Heavenly”       in Greek religion, one of the nine Muses, patron of ...
Uranian
/yoo ray"nee euhn, -rayn"yeuhn/, adj. 1. pertaining to the planet Uranus. 2. (of males) homosexual. [1835-45; URAN(US) + -IAN; def. 2 from Aphrodite Urania heavenly Aphrodite, ...
Uraniborg
▪ observatory, Denmark       observatory established in 1576 by the Danish astronomer Tycho Brahe (Brahe, Tycho). It was the last of the primitive observatories in that ...
uranic
uranic1 /yoo ran"ik/, adj. Chem. 1. of or containing uranium, esp. in the tetravalent state. 2. containing uranium in a valence state higher than the corresponding uranous ...
uranic oxide
Chem. See uranium dioxide. [1870-75] * * *
uranide
uranide [yoor′ə nīd΄] n. any of the transuranic elements * * *
uraninite
/yoo ran"euh nuyt', -ray"neuh-/, n. a mineral, probably originally uranium dioxide, UO2, but altered by radioactive decay, and usually containing uranium trioxide, lead, radium, ...
uraniscus
/yoor'euh nis"keuhs/, n., pl. uranisci /-nis"uy/. Archit. a starlike ornament, as in a coffer of a ceiling. [ < Gk ouranískos ceiling, equiv. to ouran(ós) heaven + -iskos dim. ...
uranite
—uranitic /yoor'euh nit"ik/, adj. /yoor"euh nuyt'/, n. Mineral. any of the uranium phosphates, as autunite or torbernite. [1785-95; < G Uranit. See URANIUM, -ITE1] * * *
uranite group
the mineralogical group including uranites and related minerals. * * *
uranium
/yoo ray"nee euhm/, n. Chem. a white, lustrous, radioactive, metallic element, occurring in pitchblende, and having compounds that are used in photography and in coloring glass. ...
uranium 235
Chem. the radioactive uranium isotope having a mass number of 235, comprising 0.715 percent of natural uranium. When bombarded with neutrons it undergoes fission with the release ...
uranium 238
Chem. the radioactive uranium isotope having a mass number 238, comprising 99.28 percent of natural uranium: used chiefly in nuclear reactors as a source of the fissionable ...
uranium 239
Chem. the uranium isotope with a mass number 239. It is artificially produced by the neutron bombardment of uranium 238. Also called U-239, U 239. * * *
Uranium City
▪ Saskatchewan, Canada       municipal corporation, centre of the Beaverlodge Lake mining region in extreme northwestern Saskatchewan, Canada. It lies near the north ...
uranium dating
a method of dating archaeological or geological specimens by determining the decay activity of the uranium in a given sample. * * *
uranium dioxide
Chem. a black, crystalline compound, UO2, insoluble in water, used in nuclear fuel rods, in ceramics, and pigments. Also called urania, uranic oxide, uranium oxide. * * *
uranium hexafluoride
Chem. a colorless, water-insoluble, crystalline, volatile solid, UF6, used in its gaseous state in separating uranium 235 from uranium. [1940-45] * * *
uranium oxide
Chem. 1. any of the compounds of uranium and oxygen, as UO2, UO3, U4O9, or U3O8. 2. See uranium dioxide. Cf. yellowcake. [1885-90] * * *
uranium processing
Introduction       preparation of the ore for use in various products.       Uranium (U), although very dense (19.1 grams per cubic centimetre), is a relatively ...
uranium series
Chem. the radioactive series that starts with uranium 238 and ends with a stable isotope of lead of mass number 206. Also, uranium-radium series /yoo ray"nee euhm ray"dee ...
uranium-234-uranium–238 dating
Method of age determination that makes use of the radioactive decay of uranium-238 to uranium-234; the method can be used for dating sediments from either a marine or a playa ...
uranium-234–uranium-238 dating
      method of age determination that makes use of the radioactive decay of uranium-238 to uranium-234; the method can be used for dating of sediments from either a ...
uranium-thorium-lead dating
or common-lead dating Method of dating very old rocks by means of the amount of common lead they contain. Common lead is any lead from a rock or mineral that contains a large ...
uraniumdioxide
uranium dioxide n. A black, highly toxic crystalline powder, UO2, once used in ceramic glazes and gas mantles, now used primarily to pack nuclear fuel rods. * * *
uraniumtrioxide
uranium trioxide n. A poisonous radioactive orange powder, UO3, used for uranium refining and as a coloring agent in ceramics. * * *
urano-
a combining form meaning "heavens," used in the formation of compound words: uranography; uranometry. [ < Gk, comb. form of ouranós heavens, heaven] * * *
uranographic
See uranography. * * *
uranography
—uranographer, uranographist, n. —uranographic /yoor'euh neuh graf"ik/, uranographical, adj. /yoor'euh nog"reuh fee/, n. the branch of astronomy concerned with the ...
uranology
—uranological /yoor'euh nl oj"i keuhl/, adj. /yoor'euh nol"euh jee/, n., pl. uranologies. Astron. 1. uranography. 2. a treatise on the celestial bodies. [1725-35; URANO- + ...
uranometry
—uranometrical /yoor'euh neuh me"tri keuhl/, adj. /yoor'euh nom"i tree/, n. Astron. 1. a chart of the positions of the heavenly bodies on the celestial sphere. 2. the ...
uranoscopid
/yoor'euh nos"keuh pid/, n. 1. any fish of the family Uranoscopidae, comprising the stargazers. adj. 2. belonging or pertaining to the family Uranoscopidae. [ < NL Uranoscopidae ...
uranous
/yoor"euh neuhs, yooh ray"-/, adj. Chem. containing trivalent uranium. [1835-45; URAN(IUM) + -OUS] * * *
Uranus
/yoor"euh neuhs, yoo ray"-/, n. 1. Astron. the planet seventh in order from the sun, having an equatorial diameter of 32,600 miles (56,460 km), a mean distance from the sun of ...
uranyl
—uranylic, adj. /yoor"euh nil/, n. Chem. the bivalent ion UO2+2, or the group UO2, which forms salts with acids. [1840-50; URAN(IUM) + -YL] * * *
Urartian
/oo rahr"tee euhn/, adj. 1. of or pertaining to Urartu, its people, or their language. n. 2. a native or inhabitant of Urartu. 3. the non-Semitic, non-Indo-European language of ...
Urartian language
also called  Chaldean  or  Vannic        ancient language spoken in northeastern Anatolia and used as the official language of Urartu in the 9th–6th centuries BCE. ...
Urartu
/oo rahr"tooh/, n. an ancient kingdom, c1270-750 B.C., in E Turkey, on the shore of Lake Van: often invaded by Assyria. * * * Ancient kingdom around Lake Van, southwestern ...
urase
/yoor"ays, -ayz/, n. Biochem. urease. * * *
urate
—uratic /yoo rat"ik/, adj. /yoor"ayt/, n. Chem. a salt of uric acid. [1790-1800; UR(IC ACID) + -ATE2] * * *
Urawa
/oo rddah"wah/; Eng. /oo rah"weuh/, n. a city in E Honshu, in Japan. 358,180. * * *
Urayasu
▪ Japan       city, northwestern Chiba ken (prefecture), east-central Honshu, Japan. Lying on a flat plain along Tokyo Bay, it is separated from the city of Tokyo to ...
urb
/errb/, n. Informal. an urban area. [1965-70; back formation from SUBURB] * * *
urban
/err"beuhn/, adj. 1. of, pertaining to, or designating a city or town. 2. living in a city. 3. characteristic of or accustomed to cities; citified: He is an urban type. [1610-20; ...
urban climate
Any set of climatic conditions that prevails in a large metropolitan area and that differs from the climate of its rural surroundings. Urban climates are distinguished from ...
urban contemporary music
▪ music also known as  urban music        musical genre of the 1980s and '90s defined by recordings by rhythm-and-blues (rhythm and blues) or soul (soul music) ...
urban culture
▪ sociology Introduction       any of the behavioral patterns of the various types of cities and urban areas, both past and present. Definitions of the city and urban ...
Urban Development Corporation
any of several organizations started by the British government to develop and improve areas of the inner cities. The first two were started in 1981 in London’s Docklands and in ...
urban district
a minor administrative division in England, Wales, and Northern Ireland, with local self-government by a district council, but lacking the charter of a borough. * * *
urban guerrilla
a member of any underground political group engaged in terrorism or violence in urban areas, esp. during the 1970s. [1965-70] * * *
urban homesteading
—urban homesteader. homesteading (def. 2). [1970-75; HOMESTEAD + -ING1] * * *
Urban I
/err"beuhn/, Saint pope A.D. 222-230. * * *
Urban I, Saint
▪ pope born , Rome? died 230, Rome [Italy]; feast day May 25       pope from 222 to 230. Succeeding that of St. Calixtus I, his pontificate occurred within the reign of ...
Urban II
(Odo or Otho) c1042-99, French ecclesiastic: pope 1088-99. * * * orig. Odo of Châtillon-sur-Marne born с 1035, Châtillon-sur-Marne, or Lagery, or Lagny, Champagne, ...
Urban III
(Uberto Crivelli) Italian ecclesiastic: pope 1185-87. * * * ▪ pope original name  Umberto Crivelli   born Milan died Oct. 19/20, 1187, Ferrara, Romagna       pope ...
Urban IV
(Jacques Pantaléon) died 1264, French ecclesiastic: pope 1261-64. * * * ▪ pope original name  Jacques Pantaléon   born c. 1200, Troyes, Champagne died Oct. 2, 1264, ...
Urban League
(also the National Urban League) a US organization of people who work without pay to help African Americans and other minority groups to gain equal rights. It was established in ...
urban legend
a modern story of obscure origin and with little or no supporting evidence that spreads spontaneously in varying forms and often has elements of humor, moralizing, or horror: Are ...
urban planning
urban planning n. the study or profession dealing with the growth and functioning of cities and towns, including environmental concerns, zoning, the infrastructure, etc. urban ...
urban planning.
See city planning. * * *
urban renewal
the rehabilitation of city areas by renovating or replacing dilapidated buildings with new housing, public buildings, parks, roadways, industrial areas, etc., often in accordance ...
urban revolution
▪ anthropology       in anthropology and archaeology, the processes by which agricultural village societies developed into socially, economically, and politically ...
urban sociology
the sociological study of cities and their role in the development of society. * * *
urban sprawl
the uncontrolled spread of urban development into neighboring regions. [1955-60] * * *
Urban V
(Guillaume de Grimoard) c1310-70, French ecclesiastic: pope 1362-70. * * *
Urban V, Blessed
▪ pope original name  Guillaume De Grimoard   born c. 1310, , Languedoc, Fr. died Dec. 19, 1370, Avignon, Provence; beatified March 10, 1870; feast day December ...
Urban VI
(Bartolomeo Prignano) c1318-89, Italian ecclesiastic: pope 1378-89. * * * orig. Bartolomeo Prignano born 1318, Naples died Oct. 15, 1289, Rome Pope (1378–89). Archbishop of ...
Urban VII
(Giovanni Battista Castagna) 1521-90, Italian ecclesiastic: pope 1590. * * * ▪ pope original name Giambattista Castagna born Aug. 4, 1521, Rome died Sept. 27, 1590, ...
Urban VIII
(Maffeo Barberini) 1568-1644, Italian ecclesiastic: pope 1623-44. * * * ▪ pope original name  Maffeo Barberini  baptized April 5, 1568, Florence died July 29, 1644, ...
Urbana
/err ban"euh/, n. 1. a city in E Illinois, adjoining Champaign. 35,978. 2. a city in W Ohio. 10,762. * * * ▪ Illinois, United States       city, seat (1833) of ...
Urbandale
/err"beuhn dayl'/, n. a town in central Iowa. 17,869. * * *
urbandance
urban dance n. Any of various dances influenced by the rhythms and techniques of funk and hip-hop music. * * *
urbandistrict
urban district n. An administrative district of England, Wales, and Northern Ireland, usually composed of several densely populated communities, resembling a borough but lacking ...
urbane
—urbanely, adv. —urbaneness, n. /err bayn"/, adj. 1. having the polish and suavity regarded as characteristic of sophisticated social life in major cities: an urbane ...
urbanely
See urbane. * * *
urbanforest
urban forest n. A dense, widespread growth of trees and other plants covering an area of a city. * * *
Urbani, Carlo
▪ 2004       Italian epidemiologist (b. Oct. 19, 1956, Castelplanio, Italy—d. March 29, 2003, Bangkok, Thai.), recognized that the SARS (severe acute respiratory ...
UrbanII
Ur·ban II (ûrʹbən), Originally Odo of Lagery. 1042?-1099. Pope (1088-1099) who promoted the First Crusade. * * *
urbanism
/err"beuh niz'euhm/, n. 1. the way of life of people who live in a large city. 2. urbanization. 3. See city planning. [1885-90; URBAN + -ISM, modeled on F urbanisme] * * *
urbanist
/err"beuh nist/, n. a person who is a specialist in urban planning. [1515-25; URBAN + -IST] * * *
urbanistic
—urbanistically, adv. /err'beuh nis"tik/, adj. of or pertaining to urbanism. [URBAN(ISM) + -ISTIC] * * *
urbanistically
See urbanistic. * * *
urbanite
/err"beuh nuyt'/, n. a resident of a city or urban community. [1895-1900; URBAN + -ITE1] * * *
urbanity
/err ban"i tee/, n., pl. urbanities. 1. the quality of being urbane; refined courtesy or politeness; suavity: He was the last word in urbanity. 2. urbanities, civilities or ...
urbanization
See urbanize. * * *       the process by which large numbers of people become permanently concentrated in relatively small areas, forming cities.       The ...
urbanize
—urbanization, n. /err"beuh nuyz'/, v.t., urbanized, urbanizing. to make or cause to become urban, as a locality. Also, esp. Brit., urbanise. [1635-45; URBAN + -IZE] * * *
urbanized
urbanized [ʉr′bənīzd΄] adj. made urban in character * * *
urbanlegend
urban legend n. An apocryphal story involving incidents of the recent past, often including elements of humor and horror, that spreads quickly and is popularly believed to be ...
urbanologist
☆ urbanologist [ʉr΄bə näl′ə jist ] n. 〚 URBAN + -O- + -LOG(Y) + -IST1〛 a student of, or specialist in, urban problems urbanology n. * * * ur·ban·ol·o·gist ...
urbanology
—urbanologist, n. /err'beuh nol"euh jee/, n. the study of urban problems, esp. as a social science. [1960-65; URBAN + -O- + -LOGY] * * *
urbanrenewal
urban renewal n. Rehabilitation of impoverished urban neighborhoods by large-scale renovation or reconstruction of housing and public works. * * *
urbansprawl
urban sprawl n. The unplanned, uncontrolled spreading of urban development into areas adjoining the edge of a city. * * *
UrbanVI
Urban VI, Originally Bartolomeo Prignano. 1318?-1389. Pope (1378-1389) who precipitated the Great Schism by alienating the French cardinals, who in turn elected an antipope ...
urbanwind
urban wind (wĭnd) n. A strong wind generated near or around a group of high-rise buildings, creating areas of intense air turbulence especially at street level. * * *
urbi et orbi
/oohrdd"bee et awrdd"bee/, Latin. to the city (Rome) and the world: the form of address of papal bulls. * * *
urbia
urbia [ʉr′bē ə] n. 〚ModL < L urbs, city + -IA〛 cities collectively, as distinguished from suburbs (suburbia) and exurbs ( exurbia) * * *
urbiculture
/err"bi kul'cheuhr/, n. the way of life characteristic of cities. [1950-55; < L urb(s) city + -I- + CULTURE] * * *
Urbino
▪ Italy Latin  Urbinum Hortense,    town, Marche (The Marches) regione, central Italy. Founded by the Umbrians, an ancient people of Italy, it was subsequently occupied by ...
Urbino maiolica
▪ pottery maiolica also spelled  Majolica,    Italian (Italy) tin-glazed earthenware made in the city of Urbino, which from around 1520 dominated the market. Early wares, ...
Urbino majolica
Italian tin-glazed earthenware made in the city of Urbino, which dominated the market from с 1520. Early wares, mostly dishes, are painted in a range of colours, dominated by ...
urceolate
/err"see euh lit, -layt'/, adj. shaped like a pitcher; swelling out like the body of a pitcher and contracted at the orifice, as a corolla. [1750-60; < NL urceolatus, equiv. to L ...
urchin
/err"chin/, n. 1. a mischievous boy. 2. any small boy or youngster. 3. See sea urchin. 4. either of two small rollers covered with card clothing used in conjunction with the ...
Urci
▪ ancient settlement, Spain       ancient settlement in southeastern Roman Hispania mentioned by Pomponius Mela (Mela, Pomponius), Pliny the Elder, and Claudius ...
urd
/oord, errd/, n. a plant, Vigna mungo, of the legume family, widely cultivated in tropical Asia for its edible seeds and for forage. Also called gram, black gram. [ < Hindi urd, ...
Urd
/oord/, n. Scand. Myth. See under Norn. [ < ON Urthr, c. OE wyrd (see WEIRD), deriv. of the Gmc root of ON vertha to become, G werden; see WORTH2] * * *
Urdaneta, Andrés de
▪ Spanish navigator born 1498, Villafranca de Oria, Spain died June 3, 1568, Mexico City       navigator whose discovery of a favourable west-to-east route across the ...
Urdu
/oor"dooh, err"-; oor dooh", err-/, n. one of the official languages of Pakistan, a language derived from Hindustani, used by Muslims, and written with Persian-Arabic letters. [ ...
Urdu language
Indo-Aryan language used by Muslims in India and Pakistan. In the sociopolitical realm, Urdu and Hindi are different languages, but the colloquial basis of both is identical, ...
Urdu literature
      writings in the Urdu language of the Muslims of Pakistan and northern India. It is written in the Perso-Arabic script, and, with a few major exceptions, the ...
URE
Undergraduate Record Examination. * * *
urea
—ureal, ureic, adj. /yoo ree"euh, yoor"ee euh/, n. 1. Biochem. a compound, CO(NH2)2, occurring in urine and other body fluids as a product of protein metabolism. 2. Chem. a ...
urea cycle
Biochem. a metabolic process by which ammonia derived from amino acids is converted into urea in the liver. Also called Krebs urea cycle. * * *
urea-formaldehyde resin
/yoo ree"euh fawr mal"deuh huyd', -feuhr-, yoor"ee euh-/, Chem. any of a group of resins formed by the interaction of urea and formaldehyde under conditions that include heat and ...
urea-formaldehyderesin
u·re·a-for·mal·de·hyde resin (yo͝o-rēʹə-fôr-mălʹdə-hīd') n. Any of various thermosetting resins made by combining urea and formaldehyde and widely used to make ...
urease
/yoor"ee ays', -ayz'/, n. Biochem. an enzyme that changes urea into ammonium carbonate, occurring in bacteria, fungi, etc. [1895-1900; URE(A) + -ASE] * * * ▪ ...
urea–formaldehyde resin
▪ chemical compound       any of a class of substances belonging to the family of organic polymers (polymer), prepared by heating urea and formaldehyde in the presence ...
uredinium
—uredinial, adj. /yoor'i din"ee euhm/, n., pl. uredinia /-din"ee euh/. Mycol. the fruiting body of the rust fungi that bears urediospores. Also, uredium. Also called ...
urediospore
/yoo ree"dee euh spawr', -spohr'/, n. Mycol. the spore of the rust fungi that appears between the aeciospore and the teliospore, commonly the summer spore. Also, uredospore /yoo ...
uredium
—uredial, adj. /yoo ree"dee euhm/, n., pl. uredia /-dee euh/. Mycol. uredinium. [ < NL; see UREDO, -IUM] * * *
uredo
/yoo ree"doh/, n. Pathol. a skin irritation; hives; urticaria. [1700-10; < L uredo blast, blight, burning itch, equiv. to ur(ere) to burn + -edo n. suffix] * * *
uredosorus
/yoo ree'deuh sawr"euhs, -sohr"-/, n., pl. uredosori /-sawr"uy, -sohr"uy/. Mycol. uredinium. [UREDO + SORUS] * * *
uredospore
uredospore [yo͞o rē′dē ō spôr΄yoo rē′də spôr΄] n. 〚L uredo (see UREDO) + SPORE〛 Bot. a thin-walled, red, summer spore of a rust fungus, produced usually on the ...
uredostage
uredostage [yo͞o rē′stāj΄] n. 〚L uredo (see UREDO) + STAGE〛 Bot. the stage in which rust fungi develop uredospores * * * u·re·do·stage ...
ureide
/yoor"ee uyd', -id/, n. Chem. an acyl urea. [1855-60; URE(A) + -IDE] * * *
uremia
/yoo ree"mee euh/, n. Pathol. a condition resulting from the retention in the blood of constituents normally excreted in the urine. Also, uraemia. [1855-60; < NL; see UR-1, ...
uremic
/yoo ree"mik/, adj. Pathol. 1. pertaining to uremia. 2. afflicted with uremia. Also, uraemic. [ < NL; see UREMIA, -IC] * * *
urena
/yoo ree"neuh/, n. any tropical plant or shrub belonging to the genus Urena, of the mallow family, having clusters of small, yellow flowers, esp. U. lobata, which yields a useful ...
ureotelic
ureotelic [yoo rē΄ə tel′ik, yoor΄ē ətel′ik] adj. 〚
ureotelism
See ureotelic. * * *
ureter
—ureteral, ureteric /yoor'i ter"ik/, adj. /yoo ree"teuhr/, n. Anat., Zool. a muscular duct or tube conveying the urine from a kidney to the bladder or cloaca. See diag. under ...
ureteral
See ureter. * * *
ureteric
See ureteral. * * *
uretero-
uretero- [yo͞o rēt′əryoo rēt′ər ō΄, yoo rēt′ərə] 〚
ureterolithotomy
/yoo ree'teuh roh li thot"euh mee/, n., pl. ureterolithotomies. Surg. incision of a ureter for removal of a calculus. [1890-95; URETER + -O- + LITHOTOMY] * * *
ureterostomy
/yoo ree'teuh ros"teuh mee/, n., pl. ureterostomies. Surg. 1. the construction of an artificial opening from the ureter through the abdominal wall or the flanks, permitting the ...
urethane
/yoor"euh thayn'/, n. Chem. 1. any derivative of carbamic acid having the formula CH2NO2R. 2. Also called ethyl carbamate, ethyl urethane. a white, crystalline, water-soluble ...
urethr-
var. of urethro- before a vowel: urethrectomy. * * *
urethra
—urethral, adj. /yoo ree"threuh/, n., pl. urethrae /-three/, urethras. Anat. the membranous tube that extends from the urinary bladder to the exterior and that in the male ...
urethral
See urethra. * * *
urethral gland
▪ anatomy also called  Littre Gland,         in male placental mammals, any of the glands that branch off the internal wall of the urethra, the passageway for both ...
urethrectomy
/yoor'euh threk"teuh mee/, n., pl. urethrectomies. Surg. excision or removal of part or all of the urethra. [1890-95; URETHR- + -ECTOMY] * * *
urethritis
—urethritic /yoor'euh thrit"ik/, adj. /yoor'euh thruy"tis/, n. Pathol. inflammation of the urethra. [1815-25; < NL; see URETHR-, -ITIS] * * * ▪ ...
urethro-
a combining form representing urethra in compound words: urethroscope. Also, esp. before a vowel, urethr-. * * *
urethroscope
—urethroscopic /yoo ree'threuh skop"ik/, adj. /yoo ree"threuh skohp'/, n. Med. an apparatus for observing the urethra. [1865-70; URETHRO- + -SCOPE] * * *
urethroscopy
/yoor'euh thros"keuh pee/, n. Med. observation of the urethra by a urethroscope. [1885-90; URETHRO- + -SCOPY] * * *
urethrostomy
/yoor'euh thros"teuh mee/, n., pl. urethrostomies. Surg. 1. the construction of an artificial opening from the urethra through the perineum, permitting the passage of urine. 2. ...
urethrotomy
/yoor'euh throt"euh mee/, n., pl. urethrotomies. Surg. an operation to cut a stricture of the urethra. [1840-50; URETHRO- + -TOMY] * * *
uretic
/yoo ret"ik/, adj. of, pertaining to, or occurring in the urine. [1840-50; < LL ureticus < Gk ouretikós, equiv. to oure- (see URETER) + -tikos -TIC] * * *
Urewe
/oo ray"way/, adj. Archaeol. of or pertaining to an early Iron Age pottery tradition of central Africa beginning in the second half of the first millennium B.C. and associated ...
Urewera National Park
▪ park, New Zealand       park in northeastern North Island, New Zealand. Established in 1954, it has an area of 821 square miles (2,127 square km) and has the largest ...
Urey
/yoor"ee/, n. Harold Clayton /klayt"n/, 1893-1981, U.S. chemist: Nobel prize 1934. * * *
Urey, Harold C(layton)
born April 29, 1893, Walkerton, Ind., U.S. died Jan. 5, 1981, La Jolla, Calif. U.S. scientist. He received his doctorate from the University of California at Berkeley and ...
Urey, Harold C.
▪ American chemist Introduction in full  Harold Clayton Urey  born April 29, 1893, Walkerton, Ind., U.S. died Jan. 5, 1981, La Jolla, Calif.       American scientist ...
Urey,Harold Clayton
U·rey (yo͝orʹē), Harold Clayton. 1893-1981. American chemist. He won a 1934 Nobel Prize for his discovery of heavy hydrogen. * * *
Urfa
/oor fah"/, n. a city in SE Turkey, E of the Euphrates River: on the site of ancient Edessa. 132,982. * * *
Urfé, Honoré d'
▪ French author born Feb. 10/11, 1567, Marseille, France died June 1, 1625, Villefranche-sur-Mer       French author whose pastoral romance L'Astrée (1607–27; ...
Urga
/oor"gah/, n. former name of Ulan Bator. * * *
urge
—urgingly, adv. /errj/, v., urged, urging, n. v.t. 1. to push or force along; impel with force or vigor: to urge the cause along. 2. to drive with incitement to speed or ...
Urgel
/oohrdd hel"/, n. a town in NE Spain, SSW of Andorra: cathedral. 8007. Also called Seo de Urgel. * * *
Urgench
▪ Uzbekistan also spelled  Urgenč,         city, south-central Uzbekistan. The city lies along the Shavat Canal and the Amu Darya (river). Urgench was founded when ...
urgency
/err"jeuhn see/, n., pl. urgencies. 1. urgent character; imperativeness; insistence; importunateness. 2. urgencies, urgent requirements or needs. [1530-40; < LL urgentia ...
urgent
—urgently, adv. /err"jeuhnt/, adj. 1. compelling or requiring immediate action or attention; imperative; pressing: an urgent matter. 2. insistent or earnest in solicitation; ...
urgently
See urgent. * * *
urger
/err"jeuhr/, n. 1. a person or thing that urges. 2. Australian Slang. a. a horse-racing tipster; tout. b. a person who takes advantage of others; confidence man. [1565-75; URGE + ...
urgicenter
/err"jeuh sen'teuhr/, n. a clinic or facility where a person can get immediate medical help in an emergency or treatment for a minor illness or injury. [1980-85; URG(ENT) + -I- + ...
Urheimat
/oor"huy'maht/; Ger. /oohrdd"huy'maht/, n. the primeval habitation of a people, esp. the prehistoric homeland of the speakers of a protolanguage. [1930-35; < G, equiv. to ur- UR- ...
Urhobo
▪ people       a people of the northwestern part of the Niger River delta in extreme southern Nigeria. They speak a language of the Benue-Congo branch of the Niger-Congo ...
Uri
Ger. /ooh"rddee/; Eng. /oor"ee/, n. a canton in central Switzerland. 33,400; 415 sq. mi. (1075 sq. km). Cap.: Altdorf. * * * ▪ canton, Switzerland       canton, central ...
Uriah
/yoo ruy"euh/, n. 1. Also, Douay Bible, Urias /yoo ruy"euhs/. Also called Uriah the Hittite. the husband of Bathsheba, and an officer in David's army. II Sam. 11. 2. a male given ...
Uriah Heep
/heep/ the hypocritical and villainous clerk in Dickens' David Copperfield. * * *
urial
/oor"ee euhl/, n. a wild, bearded sheep, Ovis vignei, of southern Asia, having a reddish coat. [1885-90; < Punjabi hureal] * * * ▪ mammal       medium-size, rather ...
Uribe Velez, Alvaro
▪ 2003       On Aug. 7, 2002, the day that Álvaro Uribe Vélez formally took office as president of Colombia, explosions rocked the centre of the nation's capital, ...
Uriburu, José Evaristo
▪ president of Argentina born Nov. 19, 1831, Salta, Argentina died Oct. 23, 1914, Buenos Aires       Argentine statesman who was his country's president in ...
Uriburu, José Félix
born July 20, 1868, Salta, Arg. died April 29, 1932, Paris, Fr. Argentine soldier and dictator. Nephew of a former president, he was a firm believer in class privileges. A ...
uric
/yoor"ik/, adj. of, pertaining to, contained in, or derived from urine. [1790-1800; UR-1 + -IC] * * *
uric acid
—uric-acid, adj. 1. Biochem. a compound, C5H4N4O3, present in mammalian urine in small amounts, and the principal nitrogenous component of the excrement of reptiles and birds, ...
uric-
var. of urico-, esp. before a vowel. * * *
uricacid
uric acid n. A semisolid compound, C5H4N4O3, that is a nitrogenous end product of protein and purine metabolism and is the chief nitrogenous component of the urine in birds, ...
uricacidemia
/yoor'ik as'i dee"mee euh/, n. Med. lithemia. [1890-95; URIC ACID + -EMIA] * * *
Urich, Robert
▪ 2003       American actor (b. Dec. 19, 1946, Toronto, Ohio—d. April 16, 2002, Thousand Oaks, Calif.), was best remembered as the engaging star of the television ...
urico-
urico- [yoor′ikyoor′i kō, yoor′ikə] 〚
uricolysis
—uricolytic /yoor'i koh lit"ik/, adj. /yoor'i kol"euh sis/, n. Biochem. the decomposition of uric acid. [URIC + -O- + -LYSIS] * * *
uricosuric
uricosuric [yoor΄i kō syoor′ik] adj. 〚 URICO- + -s- + URIC〛 increasing or promoting the urinary excretion of uric acid * * * u·ri·co·sur·ic ...
uricotelic
uricotelic [yo͞or′i kōtel′ik] adj. designating those animals, as reptiles or birds, that excrete most of their waste nitrogen in the form of uric acid, usually in the ...
uricotelism
See uricotelic. * * *
uridine
/yoor"i deen', -din/, n. Biochem. a ribonucleoside composed of ribose and uracil. * * *
Uriel
/yoor"ee euhl/, n. one of the archangels. II Esdras 4. * * * ▪ angel       in the Apocrypha, a leading angel, sometimes ranked as an archangel with Michael, Gabriel, ...
Urim and Thummim
/yoor"im, oor"-; thum"im, toom"-/, Judaism. objects, possibly made of metal or precious stones and inscribed with symbols, worn in the breastplate of the high priest and used, ...
Urimand Thummim
U·rim and Thum·mim (yo͝orʹĭm ən thŭmʹĭm, o͝orʹĭm; to͝omʹĭm) pl.n. Sacred objects carried inside the breastplate of the high priest of ancient Israel and used as ...
urin-
urin- combining form URINO-: used before a vowel * * * urin- pref. Variant of urino-. * * *
urinal
/yoor"euh nl/, n. 1. a flushable wall fixture, as in a public lavatory, used by men for urinating. 2. a building or enclosure containing such fixtures. 3. a receptacle to receive ...
urinalysis
/yoor'euh nal"euh sis/, n., pl. urinalyses /-seez'/. Med. an examination of the urine to determine the general health of the body and, specifically, kidney function, usually ...
urinary
/yoor"euh ner'ee/, adj., n., pl. urinaries. adj. 1. of or pertaining to urine. 2. pertaining to the organs secreting and discharging urine. n. Archaic. 3. urinal. [1570-80; < NL ...
urinary bladder
Anat., Zool. a distensible, muscular and membranous sac, in which the urine is retained until it is discharged from the body. Also called bladder. [1720-30] * * * ▪ human ...
urinary calculus
Pathol. a calcareous concretion in the urinary tract. [1785-95] * * *
urinary system
or renal system System that produces and discharges urine to rid the body of waste products. It consists of the kidneys, which balance electrolytes in blood, retaining and ...
urinary tract infection
infection of any part of the urinary tract, esp. the urethra or bladder, usually caused by a bacterium, Escherichia coli, and often precipitated by increased sexual activity, ...
urinary tract obstruction
▪ pathology       blockage or constriction at any point in the urinary tract that impedes the normal flow of urine and causes urine to be retained in the bladder or ...
urinary tubule
urinary tubule n. any of the long, winding tubules of the vertebrate kidney in which urine is formed: also called uriniferous tubule * * *
urinarybladder
urinary bladder n. An elastic, muscular sac situated in the anterior part of the pelvic cavity in which urine collects before excretion. * * *
urinarycalculus
urinary calculus n. A hard mass of mineral salts in the urinary tract. Also called cystolith, urolith. * * *
urinarysystem
urinary system n. The bodily system consisting of the organs that produce, collect, and eliminate urine and including the kidneys, ureters, urinary bladder, and urethra. * * *
urinarytract
urinary tract adult human urinary tract Carlyn Iverson n. A continuous anatomical tract, including the kidneys, ureters, and urethra, involved in the formation and excretion of ...
urinate
—urination, n. —urinative, adj. /yoor"euh nayt'/, v.i., urinated, urinating. to pass or discharge urine. [1590-1600; < ML urinatus, ptp. of urinare, equiv. to L urin(a) URINE ...
urination
See urinate. * * * Process of excreting urine from the bladder (see urinary system). Nerve centres in the spinal cord, brain stem, and cerebral cortex control it through ...
urinative
See urination. * * *
urinator
See urination. * * *
urine
/yoor"in/, n. the liquid-to-semisolid waste matter excreted by the kidneys, in humans being a yellowish, slightly acid, watery fluid. [1275-1325; ME < OF < L urina] * * * Liquid ...
urine analysis
urinalysis. [1880-85] * * *
uriniferous
/yoor'euh nif"euhr euhs/, adj. conveying urine. [1735-45; URINE + -I- + -FEROUS] * * *
uriniferous tubule
a urine-bearing tubule in a nephron of a kidney. [1855-65] * * *
urino-
a combining form of urine: urinoscopy. [ < L urin(a) URINE + -O-] * * *
urinogenital
/yoor'euh noh jen"i tl/, adj. genitourinary. [1830-40; URINO- + GENITAL] * * *
urinometer
/yoor'euh nom"i teuhr/, n. a device for assessing the specific gravity of urine; a hydrometer for use on urine specimens. [1835-45; URINO- + -METER] * * *
urinoscopy
/yoor'euh nos"keuh pee/, n. Med. uroscopy. [1830-40; URINO- + -SCOPY] * * *
urinous
/yoor"euh neuhs/, adj. of, pertaining to, resembling, or having the odor or qualities of urine. Also, urinose /yoor"euh nohs'/. [1635-45; < NL urinosus. See URINE, -OUS] * * *
Uris, Leon
▪ American novelist in full  Leon Marcus Uris  born August 3, 1924, Baltimore, Maryland, U.S. died June 21, 2003, Shelter Island, New York       American novelist ...
Uris, Leon Marcus
▪ 2004       American writer (b. Aug. 3, 1924, Baltimore, Md.—d. June 21, 2003, Shelter Island, N.Y.), wrote a number of best-sellers, many of which—including Battle ...
URL
1. Computers. Uniform Resource Locater: a protocol for specifying addresses on the Internet. 2. an address that identifies a particular file on the Internet, usually consisting ...
Urlacher, Brian
▪ 2007       In 2006 Brian Urlacher, middle linebacker of the National Football League (NFL) Chicago Bears, made good on the promise that he showed when he was named the ...
Urmia
/oor"mee euh/, n. Lake, a salt lake in NW Iran. ab. 2000 sq. mi. (5180 sq. km). Also called Lake Urumiyeh. * * *
Urmia, Lake
Persian Daryācheh-ye Orūmiyyeh Shallow, saline lake, northwestern Iran. The largest lake in the Middle East, it covers an area that varies from 2,000 to 2,300 sq mi (5,200 to ...
Urmia,Lake
Ur·mi·a (o͝orʹmē-ə), Lake A shallow saline lake of northwest Iran between Tabriz and the Turkish border. The city of Urmia, on the western side of the lake, is reputed to ...
urn
—urnlike, adj. /errn/, n. 1. a large or decorative vase, esp. one with an ornamental foot or pedestal. 2. a vase for holding the ashes of the cremated dead. 3. a large metal ...
urn moss
▪ Physcomitrium       any plant of the genus Physcomitrium (subclass Bryidae), characterized by urn-shaped or top-shaped capsules (spore cases) with lobed, hoodlike ...
urnfield
/errn"feeld'/, n. a Bronze Age cemetery in which the ashes of the dead were buried in urns. [1885-90; URN + FIELD] * * *
Urnfield culture
Late Bronze Age culture of Europe, so called because its people placed their cremated dead in urns. This culture spread from east-central Europe and northern Italy in the 12th ...
uro-
uro-1 a combining form meaning "urine," used in the formation of compound words: urology. Also, esp. before a vowel, ur-. [ < Gk, comb. form of oûron urine] uro-2 a combining ...
urochord
—urochordal, adj. /yoor"euh kawrd'/, n. Zool. the notochord of an ascidian or tunicate, more conspicuous in the larva than in the adult and confined chiefly to the caudal ...
urochordate
/yoor'euh kawr"dayt/, Zool. adj. 1. having a urochord. n. 2. a urochordate animal. [1945-50; < NL Urochordata; see URO-2, CHORD1, -ATA1] * * *
urochrome
/yoor"euh krohm'/, n. Biochem. a yellow-colored pigment that gives the color to urine. [1860-65; URO-1 + CHROME] * * *
urodele
urodele [yoor′ədēl΄] n. 〚Fr urodèle < ModL Urodela < uro- (see URO-2) + Gr -dēlos, visible < IE base * dei-, to shine > L dies, day〛 SALAMANDER * * * u·ro·dele ...
urogenital
/yoor'oh jen"i tl/, adj. genitourinary. [1840-50; URO-1 + GENITAL] * * *
urogenital malformation
Defect in the organs or tissues of the urinary system or in the sex organs (genitals). In polycystic kidney disease (an inherited disease), cysts of varying size enlarge one or ...
urogenital system
▪ anatomy also called  genitourinary system        in vertebrates, the organs concerned with reproduction and urinary excretion. Although their functions are ...
urogenitalsystem
urogenital system n. The complex of organs of the urinary system and their associated genital structures. Also called genitourinary system. * * *
urogenous
/yoo roj"euh neuhs/, adj. Physiol. 1. secreting or producing urine. 2. contained in urine. [URO-1 + -GENOUS] * * *
urogram
u·ro·gram (yo͝orʹə-grăm') n. A radiograph of the urinary tract. * * *
urographic
See urography. * * *
urography
u·rog·ra·phy (yo͝o-rŏgʹrə-fē) n. pl. u·rog·ra·phies Radiography of the urinary tract.   u'ro·graphʹic (yo͝or'ə-grăfʹĭk) adj. * * * ▪ ...
urokinase
/yoor'euh kuy"nays, -nayz/, n. Biochem., Pharm. an enzyme, present in the blood and urine of mammals, that activates plasminogen and is used medicinally to dissolve blood ...

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