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heter- pref. Variant of hetero-. * * *
/het"euh roh'/, adj., n., pl. heteros. adj. 1. Chem. of or pertaining to an atom other than carbon, particularly in a cyclic compound. 2. Informal. heterosexual. n. 3. Informal. ...
a combining form meaning "different," "other," used in the formation of compound words: heterocyclic. Also, esp. before a vowel, heter-. [comb. form of Gk héteros the other of ...
/het'euh roh ar'euh mat"ik/, n. Chem. a heterocyclic aromatic compound. [1955-60; HETERO- + AROMATIC] * * *
/het'euh roh at"euhm/, n. Chem. an atom other than carbon in the ring structure of a heterocyclic compound. [1895-1900; HETERO- + ATOM] * * *
/het'euh roh awk"sin/, n. Biochem. See indoleacetic acid. [1930-35; HETERO- + AUXIN] * * *
See heterocarpy. * * *
het·er·o·car·py (hĕtʹə-rō-kär'pē) n. Production of more than one kind of fruit.   het'er·o·carʹpous (-kärʹpəs) adj. * * *
—heterocercality /het'euhr oh seuhr kal"i tee/, n. /het'euhr euh serr"keuhl/, adj. Ichthyol. having an unequally divided tail, characteristic of sharks, rays, and skates. Cf. ...
▪ protozoan order       any protozoan of the plantlike flagellate order Heterochlorida. Heterochlorids have two flagella of unequal length and chromatophores with yellow ...
—heterochromatism /het'euhr euh kroh"meuh tiz'euhm/, n. /het'euhr euh kroh mat"ik, -oh kreuh-/, adj. 1. of, having, or pertaining to more than one color. 2. having a pattern of ...
/het'euhr euh kroh"meuh tin/, n. Genetics. the dense, highly stainable part of a chromosome. Cf. euchromatin. [1930-35; HETERO- + CHROMATIN] * * *
See heterochromatic. * * *
/het"euhr euh krohm'/, adj. heterochromatic. [1930-35; HETERO- + -CHROME] * * *
/het'euhr euh kroh"meuh sohm'/, n. Genetics. See sex chromosome. [1900-05; HETERO- + CHROMOSOME] * * *
/het'euhr euh kroh"meuhs/, adj. of different colors. [1835-45; HETERO- + CHROMOUS] * * *
—heterochronic /het'euhr euh kron"ik/, heterochronistic, heterochronous, adj. /het'euh rok"reuh nee/, n. Biol. a genetic shift in timing of the development of a tissue or ...
/het'euh rok"theuh neuhs/, adj. not indigenous; foreign (opposed to autochthonous): heterochthonous flora and fauna. [1890-95; HETERO- + Gk chthón the earth, land, country + ...
/het"euhr euh kluyt'/, adj. Also, heteroclitic /het'euhr euh klit"ik/, heteroclitical. 1. irregular or abnormal; anomalous. 2. Gram. irregular in inflection; having inflected ...
See heterocyclic. * * *
—heterocycle /het"euhr euh suy'keuhl/, n. /het'euhr euh suy"klik, -sik"lik/, adj. Chem. 1. of or pertaining to the branch of chemistry dealing with cyclic compounds in which at ...
heterocyclic compound
Any of a class of organic compounds whose molecules contain one or more rings of atoms with at least one atom (the heteroatom) being an element other than carbon, most frequently ...
/het"euhr euh sist'/, n. Bacteriol. one of the enlarged nitrogen-fixing cells occurring along the filaments in some blue-green algae. [1870-75; HETERO- + CYST] * * *
/het'euh roh dak"teuh leuhs/, adj. Ornith. having the first and fourth toes directed backward, and the second and third forward, as in trogons. Also, heterodactyl. [1850-55; ...
—heterodoxly, adv. /het"euhr euh doks'/, adj. 1. not in accordance with established or accepted doctrines or opinions, esp. in theology; unorthodox. 2. holding unorthodox ...
/het"euhr euh dok'see/, n., pl. heterodoxies. 1. heterodox state or quality. 2. a heterodox opinion, view, etc. [1645-55; < Gk heterodoxía. See HETERODOX, -Y3] * * *
/het"euhr euh duyn'/, adj., v., heterodyned, heterodyning. Radio. adj. 1. noting or pertaining to a method of changing the frequency of an incoming radio signal by adding it to a ...
heteroecious [het΄ər ē′shəs] adj. 〚
—heteroecious /het'euh ree"sheuhs/, adj. —heteroeciously, adv. /het'euh ree"siz euhm/, n. Biol. the development of different stages of a parasitic species on different host ...
/het'euhr euh gam"eet, -euh roh geuh meet"/, n. Cell Biol. either of a pair of conjugating gametes differing in form, size, structure, or sex. Cf. isogamete. [1895-1900; HETERO- ...
/het'euh roh geuh met"ik/, adj. Genetics. (of a species or individual organism) having two unlike gametes. Cf. homogametic. [1905-10; HETERO- + GAMETIC] * * *
See heterogamy. * * *
/het'euh rog"euh meuhs/, adj. 1. Genetics. having unlike gametes, or reproducing by the union of such gametes (opposed to isogamous). 2. Bot. having flowers or florets of two ...
/het'euh rog"euh mee/, n. heterogamous state. [1870-75; HETERO- + -GAMY] * * *
/het'euh roh jeuh nee"i tee/, n. the quality or state of being heterogeneous; composition from dissimilar parts; disparateness. [1635-45; < ML heterogeneitas. See HETEROGENEOUS, ...
—heterogeneously, adv. —heterogeneousness, n. /het'euhr euh jee"nee euhs, -jeen"yeuhs/, adj. 1. different in kind; unlike; incongruous. 2. composed of parts of different ...
heterogeneous reaction
▪ chemical reaction       any of a class of chemical reactions in which the reactants are components of two or more phases (solid and gas, solid and liquid, two ...
See heterogeneous. * * *
See heterogeneously. * * *
/het'euhr euh jen"euh sis/, n. Biol. 1. Also, heterogeny /het'euh roj"euh nee/. alternation of generations, esp. the alternation of parthenogenetic and sexual generations. 2. ...
—heterogenetically, adv. /het'euh roh jeuh net"ik/, adj. of, pertaining to, or characterized by heterogenesis. Also, heterogenic /het'euhr euh jen"ik/. [1870-75; HETERO- + ...
/het'euh roj"euh neuhs/, adj. Biol., Pathol. having its source or origin outside the organism; having a foreign origin. [1685-95; HETERO- + -GENOUS] * * *
See heterogenous1. * * *
—heterogonously, adv. /het'euh rog"euh neuhs/, adj. 1. Bot. of or pertaining to monoclinous flowers of two or more kinds occurring on different individuals of the same species, ...
/het'euh rog"euh nee/, n. Biol. 1. the alternation of dioecious and hermaphroditic individuals in successive generations, as in certain nematodes. 2. the alternation of ...
/het"euhr euh graft', -grahft'/, n. Surg. xenograft. [1905-10; HETERO- + GRAFT1] * * *
—heterographic /het'euhr euh graf"ik/, heterographical, adj. /het'euh rog"reuh fee/, n. 1. spelling different from that in current use. 2. the use of the same letter or ...
/het'euh roj"euh neuhs/, adj. Zool. having females of two different kinds, one sexual and the other abortive or neuter, as ants. [1850-55; HETERO- + -GYNOUS] * * *
/het'euhr euh kar"ee on', -euhn/, n., pl. heterokarya /-kar"ee euh/. Biol. a cell containing two or more nuclei of differing genetic constitutions. [1940-45; HET-ERO- + Gk ...
—heterokaryotic /het'euhr euh kar'ee ot"ik/, adj. /het'euhr euh kar'ee oh"sis/, n. Biol. condition in which a binucleate or multinucleate cell contains genetically dissimilar ...
See heterokaryon. * * *
/het'euhr euh les"euh theuhl/, adj. Embryol. having an unequal distribution of yolk, as certain eggs or ova. [1890-95; HETERO- + LECITHAL] * * *
/het'euh rol"euh geuhs/, adj. 1. Biol. of different origin; pertaining to heterology. 2. Med., Pathol. consisting of dissimilar tissue, as that of another species or that of a ...
See heterologous. * * *
/het'euh rol"euh jee/, n. 1. Biol. the lack of correspondence of apparently similar organic structures as the result of unlike origins of constituent parts. 2. Pathol. ...
heterolysis [het΄ər äl′ə sis] n. 〚 HETERO- + -LYSIS〛 1. the destruction of cells of one species by lysins or enzymes derived from cells of a different species 2. Chem. ...
See heterolysis. * * *
/het'euh rom"euhr euhs/, adj. having or consisting of parts that differ in quality, number of elements, or the like: a heteromerous flower. [1820-30; HETERO- + -MEROUS] * * *
heterometabolism [het΄ər ō mə tab′ə liz΄əm] n. 〚 HETERO- + METABOLISM〛 insect development in which the young hatch in a form very similar to the adult and then ...
—heterometabolism, heterometaboly, n. /het'euh roh mi tab"euh leuhs/, adj. Entomol. undergoing development in which the young are born adultlike in form, often maturing without ...
—heteromorphism, heteromorphy, n. /het'euhr euh mawr"fik/, adj. 1. Biol. dissimilar in shape, structure, or magnitude. 2. Entomol. undergoing complete metamorphosis; possessing ...
See heteromorphic. * * *
—heteronomously, adv. /het'euh ron"euh meuhs/, adj. 1. subject to or involving different laws. 2. pertaining to or characterized by heteronomy. 3. Biol. subject to different ...
See heteronomous. * * *
/het'euh ron"euh mee/, n. the condition of being under the domination of an outside authority, either human or divine. [1815-25; HETERO- + -NOMY] * * *
/het"euhr euh nim/, n. a word spelled the same as another but having a different sound and meaning, as lead (to conduct) and lead (a metal). [1880-85; < LGk heterónymos. See ...
—heteronymously, adv. /het'euh ron"euh meuhs/, adj. 1. of, pertaining to, or characteristic of a heteronym. 2. having different names, as a pair of correlatives: Father and son ...
/het'euh roh ooh"see euhn, -ow"see euhn/, Eccles. n. 1. a person who believes the Father and the Son to be unlike in substance or essence; an Arian (opposed to ...
/het"euhr euh fil/, adj. 1. Also, heterophilic. Immunol. (of an antibody) having an affinity for an antigen other than its specific antigen. n. 2. Cell Biol. a neutrophil. Also, ...
See heterophony. * * *
—heterophonic /het'euhr euh fon"ik/, adj. /het'euh rof"euh nee/, n. Music. the simultaneous performance of the same melodic line, with slight individual variations, by two or ...
—heterophoric /het'euhr euh fawr"ik, -for"-/, adj. /het'euhr euh fawr"ee euh, -fohr"-/, n. Ophthalm. a latent strabismus of one or both eyes. [1885-90; HETERO- + Gk -phoria a ...
—heterophylly, n. /het'euhr euh fil"euhs/, adj. Bot. having different kinds of leaves on the same plant. [1820-30; HETERO- + -PHYLLOUS] * * *
See heterophyllous. * * *
—heterophytic /het'euhr euh fit"ik/, adj. /het"euhr euh fuyt'/, n. Bot. a plant that secures its nutrition directly or indirectly from other organisms; a parasite or ...
See heterophyte. * * *
/het'euhr euh play"zheuh, -zhee euh, -zee euh/, n. Pathol. the replacement of normal cells by abnormal cells, as in cancer. [HETERO- + -PLASIA] * * *
See heteroplasty. * * *
—heteroplastic, adj. /het"euhr euh plas'tee/, n., pl. heteroplasties. Surg. the repair of lesions with tissue from another individual or species. [1850-55; HETERO- + -PLASTY] * ...
heteroploid [het′ər əploid΄] adj. 〚 HETERO- + -PLOID〛 having a chromosome number that is other than a simple multiple of the haploid number: see ...
See heteroploid. * * *
—heteropolarity /het'euh roh poh lar"i tee/, n. /het'euhr euh poh"leuhr/, adj. Chem. polar (def. 4). [1895-1900; HETERO- + POLAR] * * *
▪ insect order Introduction   any member of the insect order Heteroptera, which comprises the so-called true bugs. (Some authorities use the name Hemiptera; others consider ...
/het'euh rop"teuhr euhs/, adj. belonging or pertaining to the Heteroptera, in some classifications a suborder of hemipterous insects comprising the true bugs. [1890-95; < NL ...
/het'euh rop"tiks/, n. (used with a sing. v.) incorrect or perverted perception of what is seen; hallucinatory vision. [1705-15; HETER- + OPTICS] * * *
/het"euhr euh seks'/, n. Informal. heterosexuality. [HETERO- + SEX, on the model of HETEROSEXUAL] * * *
—heterosexist, n., adj. /het'euhr euh sek"siz euhm/, n. a prejudiced attitude or discriminatory practices against homosexuals by heterosexuals. [HETERO(SEXUAL) + SEXISM] * * *
See heterosexism. * * *
/het'euhr euh sek"shooh euhl/ or, esp. Brit., /-seks"yooh-/, adj. 1. of, pertaining to, or exhibiting heterosexuality. 2. Biol. pertaining to the opposite sex or to both ...
/het'euhr euh sek'shooh al"i tee/ or, esp. Brit., /-seks'yooh-/, n. sexual feeling or behavior directed toward a person or persons of the opposite sex. [1895-1900; HETERO- + ...
See heterosexual. * * *
/het'euh roh"sis/, n. Genetics. the increase in growth, size, fecundity, function, yield, or other characters in hybrids over those of the parents. Also called hybrid ...
heterospecific mating
▪ biology also called  incompatible mating        mating in which the man and woman have incompatible blood types, such that the woman may develop antibodies ...
heterosphere [het′ər ō sfir΄] n. the upper of two divisions of the earth's atmosphere, above c. 70 km (43 mi), characterized by variation in its component gases: cf. ...
/het'euh ros"peuh reuhs, het'euhr euh spawr"euhs, -spohr"-/, adj. Bot. having more than one kind of spore. [1870-75; HETERO- + -SPOROUS] * * *
/het'euh ros"peuh ree/, n. Bot. the production of both microspores and megaspores. [1895-1900; HETERO- + -SPORE + -Y3] * * *
/het'euh ros"treuh keuhn/, n. Paleontol. any of several ostracoderms of the order Heterostraci, from the Silurian and Devonian Periods, having the anterior part of the body ...
/het"euhr euh stuyld'/, adj. (of a plant) having styles of different forms or lengths in the flowers. Also, heterostylous. [1870-75; HETERO- + -STYLE1 + -ED3] * * *
See heterostyled. * * *
heterostyly [het′ər ō stī΄lē] n. 〚 HETERO- + STYL(E) + -Y4〛 the condition in which flowers on polymorphous plants have styles of different lengths, thereby encouraging ...
/het'euhr euh tak"tik/, adj. of, pertaining to, or characterized by heterotaxis. Also, heterotactous, heterotaxic /het'euhr euh tak"sik/. [HETERO- + Gk takt(ós) fixed, ordered, ...
See heterotactic. * * *
/het'euhr euh tak"sis/, n. abnormal or irregular arrangement, as of parts of the body, geological strata, etc. Also, heterotaxia /het'euhr euh tak"see euh/, heterotaxy. [HETERO- ...
—heterotelism, n. /het'euhr euh tel"ik, -tee"lik/, adj. (of an entity or event) having the purpose of its existence or occurrence outside of or apart from itself. Cf. ...
—heterothallism, n. /het'euhr euh thal"ik/, adj. Mycol. 1. having mycelia of two unlike types, both of which must participate in the sexual process. Cf. homothallic (def. ...
See heterothallic. * * *
See heterosis. * * *
—heterotopic /het'euhr euh top"ik/, heterotopous, adj. /het'euhr euh toh"pee euh/, n. Pathol. 1. misplacement or displacement, as of an organ. 2. the formation of tissue in a ...
het·er·o·top·ic (hĕt'ər-ə-tŏpʹĭk) adj. 1. Medicine. a. Occurring in an abnormal anatomic location: heterotopic bone formation. b. Grafted or transplanted into an ...
—heterotrichous /het'euh ro"treuh keuhs/, adj. /het"euhr euh trik/, n. any ciliate of the suborder Heterotricha, having the body covered uniformly with short cilia. [ < NL ...
/het"euhr euh trof', -trohf'/, n. Biol. an organism requiring organic compounds for its principal source of food. Cf. autotroph. [1895-1900; HETERO- + -TROPH] * * *
/het'euhr euh trof"ik, -troh"fik/, adj. Biol. capable of utilizing only organic materials as a source of food. [1890-95; HETERO- + -TROPHIC] * * *
See heterotrophic. * * *
See heterotrophic. * * *
/het'euhr euh tip"ik/, adj. Biol. of or pertaining to the first or reductional division in meiosis. Also, heterotypical. Cf. homeotypic. [1885-90; HETERO- + -TYPIC] * * *
See Heteroousian. * * *
/het'euh roh zuy goh"sis/, n. Biol. the state of being a heterozygote. [1900-05; HETERO- + ZYGOSIS] * * *
See heterozygous. * * *
/het'euhr euh zuy"goht, -zig"oht/, n. Genetics. a hybrid containing genes for two unlike forms of a characteristic, and therefore not breeding true to type. [1900-05; HETERO- + ...
—heterozygosity /het'euh roh zuy gos"i tee/, n. /het'euhr euh zuy"geuhs/, adj. Biol. 1. having dissimilar pairs of genes for any hereditary characteristic. 2. of or pertaining ...
/het, hes/; Seph. Heb. /khet/; Ashk. Heb /khes/, n. 1. the eighth letter of the Hebrew alphabet. 2. the sound represented by this letter. Also, cheth. [1895-1900; < Heb heth ...
Hetherington, Alastair
▪ 2000       British journalist who, in his role as the newspaper's editor (1956–75), transformed the Manchester Guardian from a well-regarded, left-of-centre regional ...
Chin. /hue"tyahn"/, n. Pinyin. Hotan. * * *
/het"meuhn/, n., pl. hetmans. 1. the title assumed by the chief of Ukrainian Cossacks of the Dnieper River region, with headquarters at Zaporozhe. 2. ataman. [1700-10; < ...
/het"meuh nayt'/, n. the authority, rule, or domain of a hetman. Also called hetmanship. [1875-80; HETMAN + -ATE3] * * *
Chem. See hexaethyl tetraphosphate. * * *
Hettangian Stage
▪ geology       lowest of the four divisions of the Lower Jurassic Series, representing all rocks formed worldwide during the Hettangian Age, which occurred between ...
Hettner, Alfred
▪ German geographer born Aug. 6, 1859, Dresden, Saxony [now in Germany] died Aug. 31, 1941, Heidelberg, Ger.       German geographer who sought to place geography on a ...
/het"ee/, n. a female given name, form of Hester or Esther. Also, Hettie. * * *
/hyooh"keuhr euh/, n. any of various North American plants belonging to the genus Heuchera, of the saxifrage family, having clusters of small, cup-shaped flowers, esp. the ...
/hyooh"leuhn duyt'/, n. a white or transparent, colorless mineral of the zeolite family, hydrous calcium aluminum silicate, CaAl2Si7O18·6H2O, occurring in basic volcanic rocks ...
/hyooh"neuh berrg'/, n. Archaeol. an excavated prehistoric site in S Germany, near Ulm, consisting chiefly of a great early Iron Age fortification dating mostly to the second ...
Heureaux, Ulises
▪ president of Dominican Republic born Oct. 21, 1845, Puerto Plata, Dominican Republic died July 26, 1899, Moca  president of the Dominican Republic who allowed most of his ...
/hoy"ri geuh/ 1. a local white wine made in the Vienna region of Austria and drunk when it is very young. 2. a Viennese inn or tavern where such wine is served and often ...
—heuristically, adv. /hyoo ris"tik/ or, often, /yoo-/, adj. 1. serving to indicate or point out; stimulating interest as a means of furthering investigation. 2. encouraging a ...
See heuristic. * * *
heuristics [hyo͞o ristiks] pl.n. heuristic methods or procedures n. the art or practice of using heuristic methods or procedures * * *
Heusler alloy
/hyoohs"leuhr/; Ger. /hoys"leuhrdd/ any of various alloys of manganese and other nonferromagnetic metals that exhibit ferromagnetism. [named after Conrad Heusler, 19th-century ...
Heuss, Theodor
born Jan. 31, 1884, Brackenheim, German Empire died Dec. 12, 1963, Stuttgart, W.Ger. German politician and author. A member of the German Democratic Party during the Weimar ...
Heutsz, Johannes Benedictus van
▪ Dutch general born Feb. 3, 1851, Coevorden, Neth. died July 10, 1924, Montreux, Switz.       Dutch general and governor-general of the Dutch East Indies (1904–09) ...
HEV abbr. hepatitis E virus. * * *
▪ Buddhist deity Tibetan  Kye-rdo-rje , Mongolian  Kevajra   in northern Buddhism, a fierce protective deity, the yab-yum (in union with his female consort, Vajrayoginī) ...
/hee"vee euh/, n. See Pará rubber. [1875-80; < NL < F hevé, perh. < an indigenous language of French Guiana] * * *
Hevelian halo
/heuh vay"lee euhn/ a faint white halo with an angular radius of 90° that is occasionally seen around the sun or the moon, thought to be caused by the reflection and refraction ...
/heuh vay"lee euhs/; Ger. /hay vay"lee oos'/, n. Johannes (Johann Hewel or Hewelke) 1. 1611-87, Polish astronomer: charted the moon's surface and discovered four comets. 2. a ...
Hevelius, Johannes
▪ Polish astronomer (Latin), German  Johann Hewel , or  Johann Howelcke , Polish  Jan Heweliusz  born Jan. 28, 1611, Gdańsk, Pol. died Jan. 28, 1687, ...
Hever Castle
a castle near Edenbridge in Kent, England, where Henry VIII is said to have stayed with Anne Boleyn, his second wife, before they were married. The castle has a fine garden in ...
▪ county, Hungary  megye (county), northern Hungary. It is bounded by the counties of Borsod-Abaúj-Zemplén to the north and east, Jász-Nagykun-Szolnok to the south, ...
/he"ve shee/, n. Georg von /ge awrddg" vawn/, 1885-1966, Hungarian chemist: Nobel prize 1943. * * *
Hevesy, Georg Charles von
▪ Hungarian-Swedish chemist also called   George Charles de Hevesy   born Aug. 1, 1885, Budapest, Austria-Hungary [now in Hungary] died July 5, 1966, Freiburg im Breisgau, ...
Hevesy,Georg von
He·ve·sy (hĕvʹə-shē, hĕʹvĕ-), Georg von or George Charles de 1885-1966. Hungarian chemist. He won a 1943 Nobel Prize for developing the use of isotopes as tracers to ...
—hewable, adj. —hewer, n. /hyooh/ or, often, /yooh/, v., hewed, hewed or hewn, hewing. v.t. 1. to strike forcibly with an ax, sword, or other cutting instrument; chop; ...
See Department of Health, Education, and Welfare. * * *
Hewart, Gordon Hewart, 1st Viscount
▪ lord chief justice of England also called (1916–22)  Sir Gordon Hewart , or (1922–40)  Baron Hewart of Bury  born Jan. 7, 1870, Bury, Lancashire, Eng. died May 5, ...
See hew. * * *
hewers of wood and drawers of water
performers of menial tasks. Josh. 9:21. * * *
Hewett, Dorothy Coade
▪ 2003       Australian writer (b. May 21, 1923, Perth, Australia—d. Aug. 25, 2002, Springwood, N.S.W., Australia), rebelled against the comforts of a conventional ...
/hyooh"ish/ or, often, /yooh"-/, n. Antony, born 1924, British astronomer: discovered pulsars; Nobel prize for physics 1974. * * *
Hewish, Antony
born May 11, 1924, Fowey, Cornwall, Eng. British astrophysicist. In 1967 Hewish determined that the regularly patterned radio signals (pulses) that Jocelyn Bell Burnell had ...
Hew·ish (hyo͞oʹĭsh), Antony. Born 1924. British astronomer. He shared a 1974 Nobel Prize in physics for his discovery of pulsars. * * *
Hewitt, Abram S(tevens)
born July 31, 1822, Haverstraw, N.Y., U.S. died Jan. 18, 1903, Ringwood, N.J. U.S. industrialist and politician. A graduate of Columbia College (now part of Columbia ...
Hewitt, Abram Stevens
▪ mayor of New York City born July 31, 1822, Haverstraw, N.Y., U.S. died Jan. 18, 1903, Ringwood, N.J.       American industrialist, philanthropist, and politician who ...
Hewitt, Henry K(ent)
▪ United States naval officer born Feb. 11, 1887, Hackensack, N.J., U.S. died Sept. 15, 1972, Middlebury, Vt.       U.S. naval officer who directed important amphibious ...
Hewitt, Lleyton
▪ 2003       Lleyton Hewitt ruled as the best male tennis player in the world in 2001 and 2002, displaying a match-playing maturity well beyond his years, earning a ...
Hewitt, Peter Cooper
▪ American electrical engineer born May 5, 1861, New York, N.Y., U.S. died Aug. 25, 1921, Paris, France       American electrical engineer who invented the ...
/hyooh"lit/ or, often, /yooh"-/, n. Maurice Henry, 1861-1923, English novelist, poet, and essayist. * * *
Hewlett, William Redington
▪ 2002       American engineer and businessman (b. May 20, 1913, Ann Arbor, Mich.—d. Jan. 12, 2001, Palo Alto, Calif.), was the cofounder of the Hewlett-Packard Co. ...
Hewlett-Packard Co.
U.S. manufacturer of computers, computer printers, and measuring instruments. Founded in 1938 in Palo Alto, Calif., by William Hewlett (1913–2001) and David Packard ...
Hewlett-Packard Company
▪ American company Introduction  American manufacturer of computers, computer peripherals, and instrumentation equipment. Headquarters are in Palo Alto, California. Founding ...
/hyoohn/ or, often, /yoohn/, adj. 1. felled and roughly shaped by hewing: hewn logs. 2. given a rough surface: hewn stone. [1300-50; ME hewen, ptp. of HEW] * * *
Hewson, William
▪ English physiologist born Nov. 14, 1739, Hexham, Northumberland, Eng. died May 1, 1774, London       British anatomist and physiologist who described blood ...
hex1 —hexer, n. /heks/, v.t. 1. to bewitch; practice witchcraft on: He was accused of hexing his neighbors' cows because they suddenly stopped giving milk. n. 2. spell; charm: ...
hex sign
any of various magical symbols of usually stylized design, as those painted on barns by the Pennsylvania Dutch for protection against evil spirits and now sometimes used for ...
1. hexagon 2. hexagonal. * * *
a combining form meaning "six," used in the formation of compound words: hexapartite. Also, esp. before a vowel, hex-. [comb. form repr. Gk héx SIX] * * *
/hek'seuh bay"sik/, adj. containing six hydrogen atoms capable of being replaced or ionized: a hexabasic acid. [1875-80; HEXA- + BASIC] * * *
/hek'seuh klawr"uyd, -klohr"-/, n. a chloride containing six atoms of chlorine. [1875-80; HEXA- + CHLORIDE] * * *
/hek'seuh klawr'oh eth"ayn, -klohr'-/, n. a colorless crystalline compound, C2Cl6, with a camphorlike odor, soluble in alcohol and ether, insoluble in water: used in organic ...
/hek'seuh klawr"euh feen', -klohr"-/, n. a white, crystalline powder, C13Cl6H6O2, insoluble in water: used as an antibacterial agent chiefly in toothpastes and soaps. [1945-50; ...
hexachloroplatinic acid
▪ chemical compound (H2PtCl6·6H2O),also called  Chloroplatinic Acid,         complex compound formed by dissolving platinum metal in aqua regia (a mixture of nitric ...
/hek"seuh kawrd'/, n. Music. a diatonic series of six tones having, in medieval music, a half step between the third and fourth tones and whole steps between the ...
hexacosanoic acid
/hek"seuh koh seuh noh"ik, hek'seuh-/. See cerotic acid. [HEXA- + Gk (eí)kos(i) twenty + -ANE + -O- + -IC] * * *
—hexadic, adj. /hek"sad/, n. 1. the number six. 2. a group or series of six. [1650-60; < LL hexad- (s. of hexas) < Gk hexad- (s. of hexás) unit of six, equiv. to héx SIX + ...
hexadecanoic acid
/hek"seuh dek'euh noh"ik, hek'seuh-/. See palmitic acid. [1900-05; HEXA- + DEC(A)- + -ANE + -O- + -IC] * * *
/hek'seuh des"euh meuhl/, adj. Computers, Math. 1. Also, hex. of or pertaining to a numbering system that uses 16 as the radix, employing the numerals 0 through 9 and ...
See hexad. * * *
—hexaemeric, adj. /hek'seuh em"euh ron'/, n. 1. the six days of the Creation. 2. a written account of them, esp. the Biblical account. Gen. 1. 3. a treatise on them. Also, ...
hexaethyl tetraphosphate
/hek'seuh eth"euhl/ a yellow, very poisonous liquid, (C2H5O)6P4O7, soluble in water, used as an insecticide. Also called HETP [1945-50; HEXA- + ETHYL] * * *
/hek'seuh floor"uyd, -flawr"-, -flohr"-/, n. a fluoride containing six atoms of fluorine. [HEXA- + FLUORIDE] * * *
/hek"seuh gon', -geuhn/, n. a polygon having six angles and six sides. [1560-70; < Gk hexágonon. See HEXA-, -GON] * * *
—hexagonally, adv. /hek sag"euh nl/, adj. 1. of, pertaining to, or having the form of a hexagon. 2. having a hexagon as a base or cross section: a hexagonal prism. 3. divided ...
hexagonal system
▪ crystallography       one of the principal categories of structures to which a given crystalline solid can be assigned. Components of crystals in this system are ...
See hexagonal. * * *
—hexagrammoid, adj., n. /hek"seuh gram'/, n. 1. a six-pointed starlike figure formed of two equilateral triangles placed concentrically with each side of a triangle parallel to ...
See hexahedron. * * *
—hexahedral, adj. /hek'seuh hee"dreuhn/, n., pl. hexahedrons, hexahedra /-dreuh/. a solid figure having six faces, as a cube. See illus. under cube. [1565-75; < Gk hexáedron. ...
—hexahemeric, adj. /hek'seuh hem"euh ron'/, n. hexaemeron. * * *
—hexahydrated, adj. /hek'seuh huy"drayt/, n. a hydrate that contains six molecules of water, as magnesium chloride, MgCl2·6H2O. [1905-10; HEXA- + HYDRATE] * * *
/hek'seuh huy"drik/, adj. Chem. (esp. of alcohols and phenols) hexahydroxy. [1880-85; HEXA- + -HYDRIC] * * *
/hek'seuh huy'droh an"l uyn'/, n. Chem. cyclohexylamine. [HEXA- + HYDRO-2 + ANILINE] * * *
/hek'seuh huy'droh ben"zeen, -ben zeen"/, n. Chem. cyclohexane. [HEXA- + HYDRO-2 + BENZENE] * * *
/hek'seuh huy'dreuh thuy"mawl, -mol/, n. Chem. menthol. [HEXA- + HYDRO-2 + THYMOL] * * *
/hek'seuh huy drok"see/, adj. (of a molecule) containing six hydroxyl groups. [HEXA- + HYDROXY] * * *
/hek'seuh huy drok"see suy'kleuh hek"sayn/, n. Chem. inositol. [HEXAHYDROXY + CYCLOHEXANE] * * *
/hek sam"euhr euhl/, adj. hexamerous. [1875-80; HEXAMER(OUS) + -AL1] * * *
See hexamerous. * * *
/hek sam"euh ron'/, n. hexaemeron. * * *
—hexamerism /hek sam"euh riz'euhm/, n. /hek sam"euhr euhs/, adj. 1. consisting of or divided into six parts. 2. Zool. having a radially symmetrical arrangement of organs in six ...
—hexametric /hek'seuh me"trik/, hexametrical, hexametral, adj. /hek sam"i teuhr/, Pros. n. 1. a dactylic line of six feet, as in Greek and Latin epic poetry, in which the first ...
/hek'seuh meuh thoh"nee euhm/, n. Pharm. a compound, C10H24N2, used in the treatment of severe hypertension to lower blood pressure and increase blood flow by blocking ...
/hek'seuh meth"euh leen'/, n. Chem. cyclohexane. [1885-90; HEXA- + METHYLENE] * * *
/hek'seuh meth"euh leen te"treuh meen'/, n. a white, crystalline, water-soluble powder, C6H12N4, used as a vulcanization accelerator, an absorbent in gas masks, in the ...
See hexameter. * * *
See hexametric. * * *
/hek'seuh naf"theen, -nap"-/, n. Chem. cyclohexane. [HEXA- + NAPHTHENE] * * *
/hek"sayn/, n. any of five isomeric hydrocarbons having the formula C6H14, of the alkane series, some of which are obtained from petroleum: used as solvents and chemical ...
hexanedioic acid
/hek"sayn duy oh"ik, hek'-/. See adipic acid. [HEX- + (BUT)ANE + DI(CARB)O(XYL)IC ACID] * * *
—hexangularly, adv. /hek sang"gyeuh leuhr/, adj. having six angles. [1655-65; HEX- + ANGULAR] * * *
/hek'seuh nuy"trayt/, n. any compound containing six nitrate groups. [HEXA- + NITRATE] * * *
hexanoic acid
/hek"seuh noh"ik, hek'seuh-/. See caproic acid. [1925-30; HEXANE + -O- + -IC] * * *
/hek'seuh pahr"tuyt/, adj. sexpartite. [HEXA- + PARTITE] * * *
—hexaplar, hexaplaric /hek'seuh plar"ik/, hexaplarian /hek'seuh plair"ee euhn/, adj. /hek"seuh pleuh/, n. (often cap.) an edition of a book, esp. the Old Testament, containing ...
—hexaploidy, n. /hek"seuh ployd'/, Biol. adj. 1. having a chromosome number that is six times the haploid number. n. 2. a hexaploid cell or organism. Cf. polyploid. [1915-20; ...
—hexapodous /hek sap"euh deuhs/, adj. /hek"seuh pod'/, n. 1. a six-legged arthropod of the class Insecta (formerly Hexapoda); an insect. adj. 2. having six feet. [1660-70; < Gk ...
See hexapod. * * *
—hexapodic /hek'seuh pod"ik/, adj. /hek sap"euh dee/, n., pl. hexapodies. Pros. a measure consisting of six feet. [1835-45; < Gk hexapod- (see HEXAPOD) + -Y3] * * *
/hek"sahr kee/, n., pl. hexarchies. a group of six allied states or kingdoms each under its own ruler. [1790-1800; HEX- + -ARCHY] * * *
—hexastichic /hek'seuh stik"ik/, adj. /hek"seuh stik'/, n. Pros. a strophe, stanza, or poem consisting of six lines. Also, hexastichon. [1605-15; shortened form of ...
/hek sas"ti kon'/, n., pl. hexasticha /-keuh/. hexastich. [1570-80; < Gk hexástichon, neut. of hexástichos of six lines. See HEXA-, STICH1] * * *
hex·a·style (hĕkʹsə-stīl') adj. Having six frontal columns in the portico, as in some Greek temples.   [Greek hexastūlos, having six columns in front : hexa-, hexa- + ...
—hexasyllabic /hek'seuh si lab"ik/, adj. /hek"seuh sil'euh beuhl/, n. a word or line of verse of six syllables. [HEXA- + SYLLABLE] * * *
—Hexateuchal, adj. /hek"seuh toohk', -tyoohk'/, n. the first six books of the Old Testament. [1875-80; HEXA- + (PENTA)TEUCH] * * *
/hek"seuh vay'leuhnt/, adj. Chem. having a valence of six. Also, sexavalent, sexivalent. [1885-90; HEXA- + -VALENT] * * *
hexenbesen [hek′sən bā΄zən] n. 〚Ger < hexe (see HEX1) + besen (see BESOM)〛 WITCHES'-BROOM * * *
See hex1. * * *
▪ England, United Kingdom       town, Tynedale district, administrative and historic county of Northumberland, England, on the upper River Tyne. Its abbey church of ...
/hek'seuh kuy"nays, -nayz/, n. Biochem. an enzyme that catalyzes the phosphorylation of hexose sugars. [1925-30; HEXO(SE) + KINASE] * * *
/hek"sohn/, n. Chem. 1. any of various organic ketones containing six atoms of carbon in the molecule. 2. See methyl isobutyl ketone. [1895-1900; HEX- + -ONE] * * *
/hek sos"euh meen'/, n. Biochem. any hexose derivative in which a hydroxyl group is replaced by an amino group. [1910-15; HEXOSE + -AMINE] * * *
/hek"seuh san'/, n. any of a group of hemicelluloses that hydrolyze to hexoses. [1890-95; HEXOSE + -AN] * * *
/hek"sohs/, n. any of a class of sugars containing six atoms of carbon, including glucose and fructose. [1890-95; HEX- + -OSE2] * * *
hex sign n. Any of various painted round signs incorporating designs, such as stylized stars, rosettes, or wheels, thought to be magical. These signs were painted on barns, ...
—hexylic, adj. /hek"sil/, adj. containing a hexyl group. [1865-70; HEX- + -YL] * * *
hexyl group
any of five univalent, isomeric groups having the formula C6H13-. Also called hexyl radical. * * *
/hek'sil reuh zawr"seuh nawl', -nol'/, n. Pharm. white or yellowish-white, needle-shaped crystals, C12H18O2, used chiefly as an antiseptic and for the expulsion of intestinal ...
/hay/, interj. 1. (used as an exclamation to call attention or to express pleasure, surprise, bewilderment, etc.) 2. Southern U.S. Informal. hello: used as a ...
hey rube
1. (used as a call to rally circus or carnival personnel in a fight, esp. in a fight with townspeople). 2. a fight between townspeople and the members of a circus or ...
heyday1 /hay"day'/, n. 1. the stage or period of greatest vigor, strength, success, etc.; prime: the heyday of the vaudeville stars. 2. Archaic. high spirits. Also, ...
Heydrich, Reinhard
▪ German Nazi official in full  Reinhard Tristan Eugen Heydrich , byname  The Hangman , German  Der Henker  born March 7, 1904, Halle, Germany died June 4, 1942, Prague, ...
Heydrich, Reinhard (Tristan Eugen)
born March 7, 1904, Halle, Ger. died June 4, 1942, Prague, Protectorate of Bohemia and Moravia German Nazi official. He resigned from the navy in 1931 to join the SS, becoming ...
/huy"dook/, n. Haiduk. Also, Heyduke, Heyduc. * * *
/hay"euhr dahl'/, n. Thor /toor/, born 1914, Norwegian ethnologist and author. * * *
Heyerdahl, Thor
born Oct. 6, 1914, Larvik, Nor. died April 18, 2002, Colla Michari, Italy Norwegian ethnologist and adventurer. After a trip to Polynesia convinced him that Polynesian culture ...
Hey·er·dahl (hāʹər-däl', hīʹ-), Thor. Born 1914. Norwegian ethnologist and explorer who led the Kon Tiki expedition (1947) on a raft across the Pacific Ocean from Peru ...
Heym, Stefan
▪ 2002 Helmut Flieg        German writer and political activist (b. April 10, 1913, Chemnitz, Ger.—d. Dec. 16, 2001, Jerusalem, Israel), as the author of over a dozen ...
Heyman, I. Michael
▪ 1995       On Sept. 19, 1994, the Smithsonian Institution inducted I. Michael Heyman, law professor and former chancellor of the University of California at Berkeley, ...
/huy"meuhnz/; Fr. /ay mahonns"/, n. Corneille /kawrdd ne"yeu/, 1892-1968, Belgian physiologist: Nobel prize for medicine 1938. * * *
Heymans, Corneille
▪ Belgian physiologist in full  Corneille-Jean-François Heymans   born March 28, 1892, Ghent, Belg. died July 18, 1968, Knokke       Belgian physiologist who ...
Heyn, Piet
▪ Dutch admiral Heyn also spelled  Hein,  original name  Pieter Pieterszoon  born Nov. 15, 1577, Delfshaven, Neth. died June 18, 1629, near Dunkirk, ...
/hay"rddawf skee/, n. Jaroslav /yah"rddaw slahf/ 1890-1967, Czech chemist: Nobel prize 1959. * * *
Heyrovský, Jaroslav
▪ Czech chemist born Dec. 20, 1890, Prague, Bohemia, Austro-Hungarian Empire [now in Czech Republic] died March 27, 1967, Prague, Czech.       Czech chemist who ...
/huy"zeuh/, n. Paul (Johann von) /powl yoh"hahn feuhn/, 1830-1914, German playwright, novelist, poet, and short-story writer: Nobel prize 1910. * * *
Heyse, Paul (Johann Ludwig von)
born March 15, 1830, Berlin, Prussia died April 2, 1914, Munich, Ger. German writer. An independent scholar, he led a circle of writers in Munich who sought to preserve ...
Heyse, Paul Johann Ludwig von
▪ German writer born March 15, 1830, Berlin, Prussia [Germany] died April 2, 1914, Munich, Ger.  German writer and prominent member of the traditionalist Munich school who ...

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