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/verr'chooh os"i tee/, n. 1. the character, ability, or skill of a virtuoso. 2. a fondness for or interest in virtu. [1665-75; VIRTUOS(O) + -ITY] * * *
/verr'chooh oh"soh/, n., pl. virtuosos, virtuosi /-see/, adj. n. 1. a person who has special knowledge or skill in a field. 2. a person who excels in musical technique or ...
—virtuously, adv. —virtuousness, n. /verr"chooh euhs/, adj. 1. conforming to moral and ethical principles; morally excellent; upright: Lead a virtuous life. 2. chaste: a ...
virtuous circle n. A condition in which a favorable circumstance or result gives rise to another that subsequently supports the first. Also called virtuous cycle.   [Modeled on ...
See virtuous. * * *
See virtuously. * * *
virtute et armis
/wirdd tooh"te et ahrdd"mees/; Eng. /veuhr tooh"tee et ahr"mis, -tyooh"-/, Latin. by virtue and arms: motto of Mississippi. * * *
—virucidal, adj. /vuy"reuh suyd'/, n. an agent for destroying viruses. [VIRU(S) + -CIDE] * * *
/vir"yeuh leuhns, vir"euh-/, n. 1. quality of being virulent. 2. Bacteriol. a. the relative ability of a microorganism to cause disease; degree of pathogenicity. b. the ...
See virulence. * * *
—virulently, adv. /vir"yeuh leuhnt, vir"euh-/, adj. 1. actively poisonous; intensely noxious: a virulent insect bite. 2. Med. highly infective; malignant or deadly. 3. ...
See virulence. * * *
vir·u·lif·er·ous (vîr'yə-lĭfʹər-əs, vîr'ə-) adj. Carrying or containing a virus: viruliferous aphids.   [virulence + -ferous.] * * *
Virunga Mountains
Volcanic range, east-central Africa. Located north of Lake Kivu, it extends for about 50 mi (80 km) along the borders of Congo (Kinshasa), Rwanda, and Uganda. Of its eight major ...
Virunga National Park
formerly Albert National Park Game preserve and gorilla sanctuary, northeastern Congo (Kinshasa). Established in 1925, it has an area of 3,012 sq mi (7,800 sq km). Its southern ...
—viruslike, adj. /vuy"reuhs/, n., pl. viruses. 1. an ultramicroscopic (20 to 300 nm in diameter), metabolically inert, infectious agent that replicates only within the cells of ...
/vuy"reuh soyd'/, n. a small particle of RNA associated with the larger RNA of some infectious plant viruses. Cf. viroid. [1980-85] * * *
▪ town, France       town, a southern suburb of Paris, Essonne département, Île-de-France région, north-central France, on the Seine River. It is a river port, ...
/wees/; Eng. /vis/, n., pl. vires /wee"rddays/; Eng. /vuy"reez/. Latin. strength; force; power. * * * ▪ island, Croatia Italian  Lissa,          Croatian island in ...
vis major
/vis" may"jeuhr/, pl. vires majores /vuy"reez meuh jawr"eez, -jor'-/, Law. See force majeure. [1595-1605; < L vis major greater force] * * *
/vee'zeuh vee"/; Fr. /vee zann vee"/, adv., adj., prep., n., pl. vis-à-vis /-veez"/; Fr. /-vee"/. adv. 1. face to face: They sat vis-à-vis at the table. adj. 2. face-to-face: a ...
1. Viscount. 2. Viscountess. * * *
1. visibility. 2. visual. * * *
/vee"zeuh/, n., pl. visas, v., visaed, visaing. n. 1. an endorsement made by an authorized representative of one country upon a passport issued by another, permitting the ...
Visa card
➡ Visa * * *
—visaged, adj. /viz"ij/, n. 1. the face, usually with reference to shape, features, expression, etc.; countenance. 2. aspect; appearance. [1250-1300; ME < AF, OF, equiv. to vis ...
/vi sah"keuh put"neuhm/, n. a seaport in Andhra Pradesh, in E India, on the Bay of Bengal. 362,270. * * *
/vi sayl"yeuh/, n. a city in central California. 49,729. * * * ▪ California, United States       city, seat (1853) of Tulare county, south-central California, U.S. It ...
/viz"euhrd/, n. vizard. * * *
/vi suy"euhn/, n., pl. Visayans, (esp. collectively) Visayan. 1. one of a Malay people, the most numerous native race of the Philippines. 2. the language of this people, an ...
Visayan Islands
a group of islands in the central Philippines, including Panay, Negros, Cebú, Bohol, Leyte, Samar, Masbate, and smaller islands. Spanish, Bisayas. * * * Group of islands, ...
Visayan Islands An island group of the central Philippines in and around the Visayan Sea between Luzon and Mindanao. * * *
Visayas [vi sä′yəz] group of islands in the central Philippines, including Cebu, Leyte, Negros, Panay, Samar, & many smaller islands: also called Visayan Islands * * * ▪ ...
/viz"bee/; Swed. /vees"byuu/, n. a seaport on the Swedish island of Gotland, in the Baltic: an important member of the Hanseatic League. 55,346. German, Wisby. * * * City (pop., ...
Visc abbrev. 1. Viscount 2. Viscountess * * *
1. Viscount. 2. Viscountess. * * *
▪ plant family       one of the mistletoe families of flowering plants of the sandalwood order (Santalales), including about 11 genera and more than 450 species of ...
/vi skah"cheuh/, n. 1. a burrowing rodent, Lagostomus maximus, about the size of a groundhog, inhabiting the pampas of Paraguay and Argentina, allied to the chinchilla. 2. Also ...
Viscardi, Henry, Jr.
▪ 2005       American activist (b. May 10, 1912, New York, N.Y.—d. April 13, 2004, Roslyn, N.Y.), campaigned for the inclusion of the physically handicapped in the ...
/vis"euhr euh/, n.pl., sing. viscus /vis"keuhs/. 1. Anat., Zool. the organs in the cavities of the body, esp. those in the abdominal cavity. 2. (not used scientifically) the ...
—viscerally, adv. /vis"euhr euhl/, adj. 1. of or pertaining to the viscera. 2. affecting the viscera. 3. of the nature of or resembling viscera. 4. characterized by or ...
visceral arch
Embryol. See branchial arch. [1865-70] * * *
visceral cleft
Embryol. See branchial cleft. [1870-75] * * *
visceral groove
Embryol. See branchial groove. * * *
visceral leishmaniasis
Pathol. kala-azar. * * *
See visceral. * * *
/vis'euh roh moh"teuhr/, adj. of or pertaining to the normal movements of the viscera, esp. the digestive tract. [1885-90; VISCER(A) + -O- + MOTOR] * * *
Vischer Family
▪ German sculptors and brass founders       sculptors and brass founders working in Nürnberg in the 15th and 16th centuries. Hermann the Elder (d. Jan. 13, 1488) ...
Vischer, Friedrich Theodor von
▪ German literary critic born June 30, 1807, Ludwigsburg, Württemberg [Germany] died Sept. 14, 1887, Gmunden, Austria       German literary critic and aesthetician ...
—viscidity, viscidness, n. —viscidly, adv. /vis"id/, adj. 1. having a glutinous consistency; sticky; adhesive; viscous. 2. Bot. covered by a sticky substance. [1625-35; < LL ...
See viscid. * * *
See viscidity. * * *
See viscidity. * * *
/vis'koh i las"tik/, adj. Physics. pertaining to a substance having both viscous and elastic properties. [1930-35; VISC(OUS) + -O- + ELASTIC] * * *
/vis"koyd/, adj. somewhat viscous. Also, viscoidal. [1875-80; VISC(OUS) + -OID] * * *
—viscometric /vis'keuh me"trik/, viscosimetric /vis'koh si me"trik/, adj. —viscometrically, adv. —viscometry, n. /vi skom"i teuhr/, n. a device for measuring ...
See viscometer. * * *
See viscometric. * * *
/vees kawn"tee/, n. an Italian family that ruled Milan and Lombardy from 1277 to 1447. * * * (as used in expressions) Tebaldo Visconti Visconti Gian Galeazzo Visconti ...
Visconti Family
▪ Milanese family       Milanese family that dominated the history of northern Italy in the 14th and 15th centuries.       Originating in the minor nobility, the ...
Visconti, Gian Galeazzo
known as Count of Valor born 1351, Milan died Sept. 3, 1402, Melegnano, near Milan Leader of Milan who brought the Visconti dynasty to its height. The son of Galeazzo II ...
Visconti, Louis-Tullius-Joachim
▪ French architect born Feb. 11, 1791, Rome died Dec. 23, 1853, Paris       Italian-born French designer of the tomb of Napoleon I.       Visconti's father, a ...
Visconti, Luchino
orig. Don Luchino Visconti, count di Modrone born Nov. 2, 1906, Milan died March 17, 1976, Rome Italian film and theatre director. Born into the nobility, he became an ...
Visconti, Matteo I
▪ Milanese ruler byname  Matteo The Great,  Italian  Matteo Il Grande  born Aug. 15, 1250, Invorio, Lombardy died June 24, 1322, Milan       early head of the ...
Visconti,Gian Galeazzo
Vis·con·ti (vĭs-kōnʹtē, vēs-), Gian Galeazzo. 1351?-1402. Milanese leader who conquered Siena (1399), Perugia (1400), and Bologna (1402) and was a noted patron of the ...
Visconti, Luchino. Duke of Modrone. 1906-1976. Italian stage and film director considered a founder of the Italian neo-realist style, which focused on ordinary people and postwar ...
Visconti-Venosta, Emilio, Marchese
▪ Italian statesman (Marquess) born Jan. 22, 1829, Milan [now in Italy] died Nov. 24, 1914, Rome       Italian statesman whose political-diplomatic career of more than ...
/vis"kohs/, n. 1. a viscous solution prepared by treating cellulose with caustic soda and carbon bisulfide: used in manufacturing regenerated cellulose fibers, sheets, or tubes, ...
viscose rayon n. A rayon made by reconverting cellulose from a soluble xanthate form to tough fibers by washing in acid. * * *
vis·co·sim·e·ter (vĭs'kə-sĭmʹĭ-tər) n. See viscometer.   vis·cos'i·metʹric (vĭ-skŏs'ə-mĕtʹrĭk) adj. * * *
See viscosimeter. * * *
/vi skos"i tee/, n., pl. viscosities. 1. the state or quality of being viscous. 2. Physics. a. the property of a fluid that resists the force tending to cause the fluid to ...
viscosity index
Auto., Mach. an arbitrary scale for lubricating oils that indicates the extent of variation in viscosity with variation of temperature. [1935-40] * * *
/vuy"kownt'/, n. 1. a nobleman next below an earl or count and next above a baron. 2. Hist. a deputy of a count or earl. 3. (in England) a sheriff. [1350-1400; ME viscounte < AF; ...
Viscount Melville Sound
formerly Melville Sound Body of water, northern Canada. Located in the Arctic Archipelago, between Melville and Victoria islands, the sound is 250 mi (400 km) long and 100 mi ...
/vuy"kownt'see/, n. the rank or station of a viscount. Also, viscountship. [1865-70; VISCOUNT + -CY] * * *
/vuy"kown'tis/, n. 1. the wife or widow of a viscount. 2. a woman holding in her own right a rank equivalent to that of a viscount. [1425-75; late ME; see VISCOUNT, -ESS] Usage. ...
ViscountMelville Sound
Vis·count Mel·ville Sound (vīʹkount mĕlʹvĭl', -vəl) An arm of the Arctic Ocean between Victoria and Melville islands in northern Canada. It is a section of the ...
/vuy"kown'tee/, n., pl. viscounties. 1. viscountcy. 2. Hist. the jurisdiction of a viscount or the territory under his authority. [1580-90; VISCOUNT + -Y3] * * *
—viscously, adv. —viscousness, n. /vis"keuhs/, adj. 1. of a glutinous nature or consistency; sticky; thick; adhesive. 2. having the property of viscosity. Also, ...
See viscous. * * *
See viscously. * * *
Visct abbrev. 1. Viscount 2. Viscountess * * *
1. Viscount. 2. Viscountess. * * *
/vis"keuhs/, n. sing. of viscera. * * *
—viselike, adj. /vuys/, n., v., vised, vising. n. 1. any of various devices, usually having two jaws that may be brought together or separated by means of a screw, lever, or ...
/vee"zay, vee zay"/, n., v.t., viséed, viséing. visa. [ < F, ptp. of viser to inspect, check; see VISA] * * * Device consisting of two parallel jaws for holding a ...
Viséan Stage
▪ geology       second of three internationally defined stages of the Mississippian Subsystem (Mississippian Subperiod), Carboniferous System (Carboniferous Period), ...
/vish"euh grahd', vis"euh grad'/, n. a town in N Hungary, NW of Budapest on the Danube: site of summit in 1991 of the leaders of Czechoslovakia, Hungary, and Poland. * * *
Vi·sha·kha·pat·nam (vĭ-shä'kə-pŭtʹnəm) See Visakhapatnam. * * * ▪ India       city, northeastern Andhra Pradesh state, southern India. It lies on the Bay of ...
/vi shin"skee/; Russ. /vi shin"skyee/, n. Andrei Yanuarievich /un drddyay" yi nooh ah"rddyi vyich/, 1883-1954, Soviet statesman. Also, Vyshinsky. * * *
Vishneva, Diana
▪ 2008 born July 13, 1976, Leningrad, U.S.S.R. [now St. Petersburg, Russia]  Within a few years of her first international appearances in the late 1990s, Russian ballerina ...
/vish nef"skah yeuh/; Russ. /vish nyef"skeuh yeuh/, n. Galina (Pavlovna) /geuh lee"neuh pahv lohv"neuh, pav-/; Russ. /gu lyee"neuh pah"vleuhv neuh/, born 1926, Soviet operatic ...
—Vishnuism, n. /vish"nooh/, n. Hinduism. 1. (in later Hinduism) "the Preserver," the second member of the Trimurti, along with Brahma the Creator and Shiva the Destroyer. 2. ...
/viz'euh bil"i tee/, n. 1. the state or fact of being visible. 2. the relative ability to be seen under given conditions of distance, light, atmosphere, etc.: low visibility due ...
visibility meter
any instrument for measuring the visual range through the atmosphere, as a transmissometer. [1955-60] * * *
—visibleness, n. —visibly, adv. /viz"euh beuhl/, adj. 1. that can be seen; perceptible to the eye: mountains visible in the distance. 2. apparent; manifest; obvious: a man ...
visible horizon
horizon (def. 1). [1695-1705] * * *
visible spectrum
Physics. the range of wavelengths of electromagnetic radiation that is normally visible, from 380 to 760 nm. * * *
visible speech
Phonet. 1. the representation in graphic or pictorial form of characteristics of speech, as by means of sound spectrograms. 2. the system of handwritten phonetic symbols invented ...
visible trade
▪ economics       in economics, exchange of physically tangible goods between countries, involving the export, import, and re-export of goods at various stages of ...
See visible. * * *
visible speech n. A system of phonetic notation used as an aid for teaching speech to hearing-impaired people and consisting of diagrams of the organs of speech in the various ...
See visibleness. * * *
—Visigothic, adj. /viz"i goth'/, n. a member of the westerly division of the Goths, which formed a monarchy about A.D. 418, maintaining it in southern France until 507 and in ...
See Visigoth. * * *
Visigothic art
 works of art produced in southern France and Spain under the Visigoths, who ruled the region between the 5th and the 8th centuries AD. The art produced during this period is ...
/vuy"zeen, vuy zeen"/, Pharm., Trademark. a brand of tetrahydrozoline. * * *
—visionless, adj. /vizh"euhn/, n. 1. the act or power of sensing with the eyes; sight. 2. the act or power of anticipating that which will or may come to be: prophetic vision; ...
vision cloth
Theat. a curtain with an inset scrim behind which a lighted scene appears, as a vision, dream, or the like. * * *
vision quest
Anthropol. (esp. among some North American Indians) the ritual seeking of personal communication with the spirit world through visions that are induced by fasting, prayer, and ...
—visionally, adv. /vizh"euh nl/, adj. 1. of or pertaining to visions. 2. belonging to or seen in a vision. [1580-90; VISION + -AL1] * * *
See visional. * * *
See visionary. * * *
—visionariness, n. /vizh"euh ner'ee/, adj., n., pl. visionaries. adj. 1. given to or characterized by fanciful, not presently workable, or unpractical ideas, views, or schemes: ...
/vizh"euhnd/, adj. 1. pertaining to, seen in, or arising from a vision: a visioned battle between good and evil. 2. gifted with prophetic vision. [1500-10; VISION + -ED2, -ED3] * ...
vi·sion·less (vĭzhʹən-lĭs) adj. 1. Lacking the faculty of sight; blind. 2. Lacking intelligent foresight or imagination; uninspired: visionless bureaucrats. * * *
vision quest n. A period of spiritual seeking among certain Native American peoples, often undertaken as a puberty rite, that typically involves isolation, fasting, and the ...
Principal school of Vedanta. Its seminal figure was Ramanuja, the first Vedanta thinker to establish as the cornerstone of his system the identification of a personal God with ...
/viz"it/, v.t. 1. to go to and stay with (a person or family) or at (a place) for a short time for reasons of sociability, politeness, business, curiosity, etc.: to visit a ...
visit and search
▪ military procedure       procedure adopted by a belligerent warship to ascertain whether a merchant vessel is liable to seizure. If an inspection of the papers shows ...
/viz"i teuh beuhl/, adj. 1. capable of, suitable for, or worthy of being visited: a visitable island; a visitable museum. 2. liable or subject to official visitation. [1595-1605; ...
▪ Spanish government official (Spanish: “inspector”),plural  Visitadores,         royally appointed official sent periodically in the late Middle Ages to ...
▪ Roman Catholic order member of  Visitation Order , formally  Congregation of the Visitation of Holy Mary (V.H.M.)        a Roman Catholic order of nuns founded by ...
/viz"i teuhnt/, n. 1. a temporary resident; visitor; guest. 2. a visitor to a place of religious or sight-seeing interest; pilgrim. 3. a being believed to come from the spirit ...
—visitational, adj. /viz'i tay"sheuhn/, n. 1. the act of visiting. 2. a formal visit, as one permitted by a court's granting of visitation rights or by parents invited to a ...
visitation rights
the legal right granted to a divorced or separated parent to visit a child in the custody of the other parent. * * *
See visitation. * * *
/viz'i teuh tawr"ee euhl, -tohr"-/, adj. 1. of or pertaining to an official visitor or official visitation. 2. having the power of visitation. [1680-90; < ML visitatori(us) (see ...
a government organization that works to encourage people from abroad to visit the UK and to encourage British people to visit tourist attractions in England. Separate ...
visiting card
visiting card n. CALLING CARD * * *
visiting card.
See calling card (def. 1). [1775-85] * * *
visiting fireman
Informal. 1. an influential person accorded special treatment while visiting an organization, industry, city, etc. 2. a visitor, as a tourist or vacationer, in a city, presumed ...
visiting nurse
a registered nurse employed by a social service agency to give medical care to the sick in their homes or to implement other public health programs. [1920-25] * * *
visiting professor
a professor from another institution invited to teach at a university or college for a limited period, usually for a semester or one academic year. [1945-50] * * *
visiting teacher
a teacher in a public school system, assigned to give home instruction to sick or disabled pupils. [1920-25] * * *
visiting team
visiting team n. Sports a team playing on the competing team's field, court, etc. * * * ➡ baseball * * *
vis·it·ing card (vĭzʹĭ-tĭng) n. See calling card. * * *
visiting fireman n. Informal 1. An important visitor who is entertained impressively. 2. A visitor, especially a tourist or conventioneer, thought to be a free spender. * * *
visiting nurse n. A registered nurse employed by a public health agency or hospital to promote community health and especially to visit and administer treatment to sick people in ...
visiting professor n. A professor on leave who is invited to serve as a member of the faculty of another college or university for a limited period of time, often an academic ...
visiting teacher n. A teacher who visits and instructs sick or disabled children in a public school system. * * *
/viz"i teuhr/, n. a person who visits, as for reasons of friendship, business, duty, travel, or the like. [1400-50; late ME visitour < AF; OF visiteor < LL visitator, equiv. to L ...
/viz'i tawr"ee euhl, -tohr"-/, adj. of or pertaining to a visitor; visitatorial. [1805-15; VISITOR + -IAL] * * *
vis ma·jor (vĭs māʹjər) n. Law pl. vi·res ma·jo·res (vī'rēz mə-jôrʹēz, -jŏrʹ-) An overwhelming force of nature having unavoidable consequences that under certain ...
/vis"neuh/, n. Vet. Pathol. a disease of sheep, caused by a quickly mutating lentivirus, and affecting the central nervous system. [1955-60; < ON visna to wither] * * *
Vi·so (vēʹzō), Mount A peak, 3,843.6 m (12,602 ft) high, of northwest Italy in the Cottian Alps near the French border. It is the highest elevation in the range. * * *
—visorless, adj. /vuy"zeuhr/, n. 1. Armor. a. (on a close helmet) a piece having slits or holes for vision, situated above and pivoted with a beaver or a ventail and beaver. ...
Visscher, Anna
▪ Dutch poet born , Feb. 2?, 1583, Amsterdam, Neth. died Dec. 6, 1651, Alkmaar       Dutch poet and daughter of the Renaissance man of letters Roemer Visscher. She was ...
Visscher, Roemer
▪ Dutch poet born , 1547, Amsterdam, Spanish Habsburg domain [now in The Netherlands] died Feb. 19, 1620, Amsterdam       poet and moralist of the early Dutch ...
Visser 't Hooft
/vis"euhrt hohft'/ Willem Adolf /vil"euhm ah"dawlf/, 1900-85, Dutch Protestant clergyman and writer: leader in ecumenical movement. * * *
Visser 't Hooft, Willem Adolph
▪ Dutch theologian born , Sept. 20, 1900, Haarlem, Neth. died July 4, 1985, Geneva, Switz.       Dutch clergyman and theologian who led the World Council of Churches as ...
—vistaless, adj. /vis"teuh/, n. 1. a view or prospect, esp. one seen through a long, narrow avenue or passage, as between rows of trees or houses. 2. such an avenue or passage, ...
/vis"teuh/, n. a town in SW California. 35,834. * * *
/vis"teuh/, n. a national program in the U.S., sponsored by ACTION, for sending volunteers into poor areas to teach various job skills. [V(olunteers) i(n) S(ervice) t(o) ...
/vis"teuh dohm'/, Railroads. n. 1. dome (def. 7). adj. 2. having a vistadome or having cars with vistadomes: a vistadome train. [1945; VISTA + DOME] * * *
/vis"teuhd/, adj. 1. possessing or forming a vista or vistas. 2. viewed in or as in a mental vista. [1825-35; VISTA + -ED3] * * *
/vis"choo leuh/, n. a river in Poland, flowing N from the Carpathian Mountains past Warsaw into the Baltic near Danzig. ab. 650 mi. (1050 km) long. Polish, Wisla. German, ...
Vistula Lagoon
▪ lagoon, Baltic Sea German  Frisches Haff , Polish  Zalew Wiślany , Russian  Vislinsky Zaliv        shallow, marsh-fringed lagoon on the Baltic coast, bisected ...
Vistula River
Polish Wisła River, Poland. It rises on the northern slope of the Carpathian Mountains in southwestern Poland, flows in a curve through Warsaw and Torun, then empties into the ...
/vizh"ooh euhl/, adj. 1. of or pertaining to seeing or sight: a visual image. 2. used in seeing: the visual sense. 3. optical. 4. perceptible by the sense of sight; visible: a ...
visual acuity
Ophthalm. acuteness of the vision as determined by a comparison with the normal ability to define certain letters at a given distance, usually 20 ft. (6 m). Abbr.: V. [1885-90] * ...
visual aid
any of various materials depending on the sense of sight, as films, slides, photographs, etc., used as aids in teaching. [1910-15] * * *
visual aids
visual aids n. films, slides, charts, and other devices involving the sense of sight (other than books), used in teaching, illustrating lectures, etc. * * *
visual arts
the arts created primarily for visual perception, as drawing, graphics, painting, sculpture, and the decorative arts. * * *
visual binary
Astron. a binary star having components that are sufficiently separated to be resolved by a telescope. Cf. spectroscopic binary. * * *
visual cortex
the portion of the cerebral cortex of the brain that receives and processes impulses from the optic nerves. * * *
visual display terminal
Computers. See video display terminal. Abbr.: VDT * * *
visual display unit
Chiefly Brit. Computers. See video display terminal. Abbr.: VDU [1970-75] * * *
visual field defect
      a blind spot (scotoma) or blind area within the normal field of one or both eyes (eye, human). In most cases the blind spots or areas are persistent, but in some ...
visual field.
See field of vision. [1880-85] * * *
visual literacy
the ability to apprehend or interpret pictures or other visual images. [1970-75] * * *
visual magnitude
Astron. magnitude (def. 5a). * * *
visual pigment
▪ physiology       any of a number of related substances that function in light reception (photoreception) by animals by transforming light energy into electrical ...
Visual properties of some luminescent materials
▪ Table Visual properties of some luminescent materials phosphor emission       (phosphor/activator; coactivator) colour* persistence rhombohedral zinc ...
visual purple
Biochem. rhodopsin. [1895-1900] * * *
visual range
Meteorol. visibility (def. 3). [1895-1900] * * *
visual-aural (radio) range
☆ visual-aural (radio) range or visual-aural range [vizh′o͞oəlôr′əl ] n. a radio range that sends out signals as an aid to air navigation; esp., a very-high-frequency ...
visual-field defect
Blind spot (scotoma) or area in the normal field of vision. It may be persistent or temporary and shifting, as in a migraine aura. The field may narrow, as in glaucoma. The ...
visual acuity n. Sharpness of vision, especially as tested with a Snellen chart. Normal visual acuity based on the Snellen chart is 20/20. * * *
visual aid n. An instructional aid, such as a poster, scale model, or videotape, that presents information visually. * * *
visual art n. 1. Art work, such as painting, photography, or sculpture, that appeals primarily to the visual sense and typically exists in permanent form. 2. Any of the art forms ...
visual binary n. A binary star that can be seen as two stars with a telescope and sometimes with the unaided eye. * * *
visual field n. The space or range within which objects are visible to the immobile eyes at a given time. Also called field of vision. * * *
See visually. * * *
See visualize. * * *
—visualizable, adj. —visualization, n. —visualizer, visualist, n. /vizh"ooh euh luyz'/, v., visualized, visualizing. v.i. 1. to recall or form mental images or ...
vi·su·al·iz·er (vĭzhʹo͞o-ə-lī'zər) n. One who visualizes, especially a person whose mental images are predominantly visual. * * *
/vizh"ooh euh lee/, adv. in a visual manner; with respect to sight; by sight. [1400-50; late ME; see VISUAL, -LY] * * *
visually impaired
1. (of a person) having reduced vision so severe as to constitute a handicap. 2. visually impaired persons collectively (usually prec. by the): a training program to aid the ...
visually impaired adj. 1. Having impaired vision; partially sighted. 2. Incapable of sight; blind. n. (used with a pl. verb) Visually impaired people considered as a group. * * *
See visually. * * *
visual purple n. See rhodopsin. * * *
vi·su·o·mo·tor (vĭzh'o͞o-ō-mōʹtər) adj. Of or relating to motor activity dependent on or involving sight: the visuomotor coordination required to write.   [visual + ...
/vizh'ooh oh spay"sheuhl/, adj. pertaining to perception of the spatial relationships among objects within the field of vision. [1960-65; < L visu(s) sight (see VISUAL) + -O- + ...
▪ Hindu mythology       (Sanskrit: “All Accomplishing”), in Hindu mythology, the architect of the gods. The name was originally used as an epithet of any powerful ...
/vuy"teuh, vee"-/; Lat. /wee"tah/, n., pl. vitae /vuy"tee, vee"tuy/; Lat. /wee"tuy/. See curriculum vitae (def. 1). Also, vitae /vuy"tee, vee"tuy/. [1920-25; < L: life] * * *
/vee"teuh/, n. a female given name, form of Davida. * * *
Vita Sackville-West
➡ Sackville-West * * *
▪ plant family       the grape family of flowering plants, in the buckthorn order (Rhamnales), comprising 12 genera of woody plants, most of them tendril-bearing vines. ...
/vuy tay"sheuhs/, adj. belonging to the Vitaceae, the grape family of plants. Cf. grape family. [ < NL Vitace(ae) family name (Vit(is) genus name (L vitis vine) + -aceae -ACEAE) ...
the most successful US film company in the early years of the film industry. It was established in 1896 in New York by two men born in Britain, Alfred E Smith and J Stuart ...
—vitally, adv. —vitalness, n. /vuyt"l/, adj. 1. of or pertaining to life: vital processes. 2. having remarkable energy, liveliness, or force of personality: a vital ...
vital capacity
Physiol. the greatest amount of air that can be forced from the lungs after maximum inhalation. [1850-55] * * *
vital force
the force that animates and perpetuates living beings and organisms. Also called vital principle. * * *
vital function
Physiol. any function of the body that is essential for life. [1795-1805] * * *
vital rates
▪ statistics       relative frequencies of vital occurrences that affect changes in the size and composition of a population. When calculated per 1,000 inhabitants—as ...
vital signs
index of essential body functions, comprising pulse rate, body temperature, and respiration. [1915-20] * * *
vital staining
vital staining n. the staining of living cells with dyes that are not poisonous * * *
vital statistics
1. statistics concerning human life or the conditions affecting human life and the maintenance of population. 2. Facetious. the measurements of a woman's figure, esp. the bust, ...
Vital, Ḥayyim ben Joseph
▪ Jewish Kabbalist born 1543, Safed, Palestine [now Ẕefat, Israel] died May 6, 1620, Damascus [now in Syria]       one of Judaism's outstanding Kabbalists (expounder ...
vital capacity n. The amount of air that can be forcibly expelled from the lungs after breathing in as deeply as possible. * * *
Vitale da Bologna
▪ Italian artist Vitale also spelled  Vidolini, or Vidolino,  also called  Vitale d'Aimo de' Cavalli, or Vitale delle Madonne   born c. 1309, , Bologna, Emilia ...
▪ plant order   grape order of flowering plants, a basal member in the rosid group of the core eudicots in the Angiosperm Phylogeny Group II (APG II) botanical classification ...
Vitali, Giovanni Battista
▪ Italian composer born Feb. 18, 1632, Bologna [Italy] died Oct. 12, 1692, Bologna       principal Italian composer of chamber music for strings in the period before ...
/vi tayl"yeuhn, -tay"lee euhn/, n. died A.D. 672, pope 657-672. * * *
Vitalian, Saint
▪ pope Latin  Vitalianus   born , Segni, Duchy of Rome died , c. Jan. 27, 672, Rome; feast day January 27       pope from 657 to 672.       Consecrated as St. ...
—vitalist, n., adj. —vitalistic, adj. —vitalistically, adv. /vuyt"l iz'euhm/ 1. the doctrine that phenomena are only partly controlled by mechanical forces, and are in some ...
See vitalism. * * *
See vitalist. * * *
/vuy tal"i tee/, n., pl. vitalities. 1. exuberant physical strength or mental vigor: a person of great vitality. 2. capacity for survival or for the continuation of a meaningful ...
See vitalize. * * *
—vitalization, n. —vitalizer, n. /vuyt"l uyz'/, v.t., vitalized, vitalizing. 1. to give life to; make vital. 2. to give vitality or vigor to; animate. Also, esp. Brit., ...
See vitalization. * * *
/vuy tal"ee euhm/, Trademark. a brand name for an alloy of cobalt, chromium, and molybdenum, having various dental and surgical applications. * * *
See vital. * * *
See vitally. * * *
/vuyt"lz/, n.pl. 1. those bodily organs that are essential to life, as the brain, heart, liver, lungs, and stomach. 2. the essential parts of something: the vitals of a ...
vital signs pl.n. The pulse rate, temperature, and respiratory rate of an individual. * * *
vital statistics pl.n. Statistics concerning the important events in human life, such as births, deaths, marriages, and migrations. * * *
vi·ta·mer (vīʹtə-mər) n. One of two or more related chemical substances that fulfill the same specific vitamin function.   [vitamin + isomer.]   vi'ta·merʹic ...
See vitamer. * * *
—vitaminic, adj. /vuy"teuh min/; Brit. also /vit"euh min/, n. any of a group of organic substances essential in small quantities to normal metabolism, found in minute amounts ...
vitamin A
a yellow, fat-soluble, solid terpene alcohol, C20H30O, obtained from carotene and occurring in green and yellow vegetables, egg yolk, etc.: essential to growth, the protection of ...
vitamin A aldehyde
retinal. * * *
vitamin A2
a yellow oil, C20H28O, similar to vitamin A, obtained from fish liver. * * *
vitamin A{}1{}
vitamin A1 n. A yellow crystalline compound, C20H30O, extracted from egg yolks, milk, and cod-liver oil. * * *
vitamin A{}2{}
vitamin A2 n. A golden yellow oil, C20H28O, occurring chiefly in the livers of freshwater fish and having about 40 percent of the biological activity of vitamin A1. * * *
vitamin B (complex)
vitamin B (complex) n. a group of unrelated water-soluble vitamins found in liver, yeast, etc., including: a) vitamin B1 (see THIAMINE) b) vitamin B2 (see RIBOFLAVIN) c) vitamin ...
vitamin B complex
an important group of water-soluble vitamins containing vitamin B1, vitamin B2, etc. [1925-30] * * * Water-soluble organic compounds with loosely similar properties, ...
vitamin B12
▪ chemical compound       a complex water-soluble organic compound that is essential to a number of microorganisms and animals, including humans. vitamin B12 aids in ...
vitamin B6
▪ chemical compound       water-soluble organic compound that is an essential micronutrient for microorganisms and animals. It occurs in three forms: pyridoxine (or ...
vitamin B12
a deep-red crystalline, water-soluble solid, C63H88N14O14PCo, obtained from liver, milk, eggs, fish, oysters, and clams: a deficiency causes pernicious anemia and disorders of ...
vitamin B1
thiamine. [1920-25] * * *
vitamin B2
riboflavin. [1925-30] * * *
vitamin B3
See nicotinic acid. * * *
vitamin B6
pyridoxine. [1930-35] * * *
vitamin B9
See folic acid. * * *
vitamin B{}12{}
vitamin B12 n. A complex compound containing cobalt, found especially in liver and widely used to treat pernicious anemia. Also called cobalamin, cyanocobalamin, extrinsic ...
vitamin B{}1{}
vitamin B1 n. See thiamine. * * *
vitamin B{}2{}
vitamin B2 n. See riboflavin. * * *
vitamin B{}6{}
vitamin B6 n. See pyridoxine. * * *
vitamin B{}c{}
vitamin Bc n. See folic acid. * * *
vitamin C
See ascorbic acid. [1920-25] * * * or ascorbic acid Water-soluble organic compound important in animal metabolism. Most animals produce it in their bodies, but humans, other ...
vitamin D
any of the several fat-soluble, antirachitic vitamins D1, D2, D3, occurring in milk and fish-liver oils, esp. cod and halibut, or obtained by irradiating provitamin D with ...
vitamin D1
a mixture of lumisterol and calciferol, obtained by ultraviolet irradiation of ergosterol. * * *
vitamin D2
calciferol. * * *
vitamin D3
a D vitamin, C27H43OH, occurring in fish-liver oils, that differs from vitamin D2 by slight structural differences in the molecule. Also called cholecalciferol. * * *
vitamin D{}2{}
vitamin D2 n. A white crystalline compound, C28H44O, produced by ultraviolet irradiation of ergosterol. Also called calciferol, ergocalciferol. * * *
vitamin D{}3{}
vitamin D3 n. A colorless crystalline compound, C27H44O, found in fish-liver oils, irradiated milk, and all irradiated animal foodstuffs. It has essentially the same biological ...
vitamin E
a pale-yellow viscous fluid, abundant in vegetable oils, whole-grain cereals, butter, and eggs, and important as an antioxidant in the deactivation of free radicals and in ...
vitamin G
riboflavin. [1925-30] * * *
vitamin H
biotin. [1930-35] * * *
vitamin K
vitamin K n. a fat-soluble vitamin, synthesized constantly by intestinal bacteria in mammals and occurring in certain green vegetables, fish meal, etc., that promotes blood ...
vitamin K1
a yellowish, oily, viscous liquid, C31H46O2, occurring in leafy vegetables, rice, bran, hog liver, etc., or obtained esp. from alfalfa or putrefied sardine meat, or synthesized, ...

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