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ammonium bifluoride
Chem. a white, crystalline, water-soluble, poisonous solid, NH4HF2, used chiefly for cleaning and sterilizing brewing and dairy equipment. * * *
ammonium binoxalate
Chem. a colorless, crystalline, water-soluble, poisonous solid, C2H5NO4·H2O, used chiefly for removing ink stains from fabrics. * * *
ammonium carbamate
Chem. a white, crystalline, water-soluble, extremely volatile powder, CH6N2O2, used as a fertilizer. * * *
ammonium carbonate
Chem. a water-soluble mixture of ammonium bicarbonate and ammonium carbamate, occurring either as a white powder or in colorless, hard, crystalline masses: used chiefly in the ...
ammonium chloride
Chem., Pharm. a white, crystalline, water-soluble powder, NH4Cl, which produces a cooling sensation on the tongue, used chiefly in the manufacture of dry cells, in ...
ammonium chrome alum
Chem. See chrome alum (def. 1). * * *
ammonium chromic sulfate
Chem. See chrome alum (def. 1). * * *
ammonium cyanate
Chem. a white, crystalline solid, CH4N2O, soluble in alcohol, that is converted into urea when heated. * * *
ammonium hydroxide
Chem. a basic compound, NH4OH, existing only in solution, formed by dissolving ammonia gas in water. Cf. ammonia. [1900-05] * * * ▪ chemical compound also called  Aqua ...
ammonium lactate
Chem. a colorless to yellow, water-soluble, syrupy liquid, C3H9NO3, used chiefly in electroplating. * * *
ammonium nitrate
Chem. a white, crystalline, water-soluble powder, NH4NO3, usually produced by reacting nitric acid with vaporous ammonia: used chiefly in explosives, fertilizers, freezing ...
ammonium phosphate
Chem. 1. See monoammonium phosphate. 2. (loosely) diammonium phosphate. * * *
ammonium purpurate
/perr"pyeuhr it, -pyeuh rayt'/, Chem. murexide. [PURPUR(IC) + -ATE2] * * *
ammonium salt
Chem. any salt containing the NH4+ ion, formed by the neutralization of ammonium hydroxide by an acid. * * *
ammonium selenate
Chem. a colorless, crystalline, water-soluble solid, (NH4)2SeO4, used as a mothproofing agent. * * *
ammonium stearate
Chem. a tan, waxlike, water-insoluble solid, C18H39NO2, used chiefly in the manufacture of cosmetics. * * *
ammonium sulfate
Chem. a white, crystalline, water-soluble solid, (NH4)2SO4, used chiefly as a fertilizer. [1800-85] * * *
ammonium thiocyanate
Chem. a colorless, crystalline, deliquescent, water-soluble solid, CH4N2S, used chiefly as a herbicide and as a fixative in textile printing. * * *
ammonium thiosulfate
Chem. a white, crystalline, water-soluble solid, (NH4)2S2O3, used chiefly in the manufacture of cleaning compounds for alloys having a tin or lead base. * * *
ammonium bicarbonate n. A white crystalline salt, bicarbonate of ammonium, NH4HCO3, used in fire-extinguishing compounds and in baking powder. * * *
ammonium carbamate n. A salt, a carbonate of ammonium, NH4NH2CO2, which is an intermediate in the manufacture of urea and a component of smelling salts. * * *
ammonium carbonate n. 1. A carbonate of ammonium, (NH4)2CO3. 2. The white, crystalline double salt of ammonium bicarbonate and ammonium carbamate, NH4HCO3·NH2COONH4, produced ...
ammonium chloride n. A slightly hygroscopic, white crystalline compound, NH4Cl, used in dry cells, as a soldering flux, and as an expectorant. Also called sal ammoniac. * * *
ammonium hydroxide n. A colorless, basic, aqueous solution of ammonia, NH4OH, used as a household cleanser and in the manufacture of a wide variety of products, including ...
ammonium nitrate n. A colorless crystalline salt, NH4NO3, used in fertilizers, explosives, and solid rocket propellants. * * *
ammonium phosphate n. A phosphate of ammonium, especially (NH4)2HPO4, used as a fire retardant and in fertilizers. * * *
ammonium sulfate n. A brownish-gray to white crystalline salt, (NH4)2SO4, used in fertilizers and water purification. * * *
ammonium thiocyanate n. A colorless, crystalline compound, NH4SCN, used in dyeing fabric, electroplating, and in making melamine. * * *
Ammonius Hermiae
▪ Greek philosopher flourished c. 550       Greek philosopher whose thinking was primarily oriented toward logic and the sciences. He spent a good part of his ...
/am"euh noh'/, adj. Chem. of, containing, or derived from ammonia. [independent use of AMMONO-] * * *
a combining form representing ammonia in compound words: ammonolysis. * * *
/am"euh noyd'/, n. any cephalopod mollusk of the extinct order Ammonoidea, from the Devonian to the Cretaceous periods, having a coiled, chambered shell. [1880-85; < NL ...
—ammonolitic /euh mohn'l it"ik, am'euh nl-/, adj. /am'euh nol"euh sis/, n., pl. ammonolyses /-seez'/. Chem. decomposition in which ammonia is resolved into other compounds by ...
/euh mohn"l uyz'/, v., ammonolyzed, ammonolyzing. Chem. v.t. 1. to subject to ammonolysis. v.i. 2. to undergo ammonolysis. [1930-35; AMMONOL(YSIS) + -IZE] * * *
ammonotelic [am΄ə nō tel′ik] adj. 〚 AMMONO- + TELIC〛 excreting ammonia as the main nitrogenous waste: characteristic of freshwater fishes and many aquatic ...
Ammons, A R
▪ 2002       American poet and scholar (b. Feb. 18, 1926, near Whiteville, N.C.—d. Feb. 25, 2001, Ithaca, N.Y.), won almost every major American poetry award during a ...
Ammons, A.R.
▪ American poet in full  Archie Randolph Ammons   born February 18, 1926, Whiteville, North Carolina, U.S. died February 25, 2001, Ithaca, New York       American ...
Ammons, Gene
▪ American musician byname  Jug,  original name  Eugene Ammons  born April 14, 1925, Chicago, Ill., U.S. died Aug. 6, 1974, Chicago       African-American jazz ...
/euh mof"euh leuhs/, adj. Biol. living or growing in sand. [1875-80; < Gk ámmo(s) sand + -PHILOUS] * * *
/am'yeuh nish"euhn/, n. 1. the material fired, scattered, dropped, or detonated from any weapon, as bombs or rockets, and esp. shot, shrapnel, bullets, or shells fired by ...
ammunition clip n. See cartridge clip. * * *
Air Force. airman. * * *
/ant, am"euhnt/ am not. Usage. See ain't. * * *
AmneMachin Shan
Am·ne Ma·chin Shan (ăm'nē mə-jĭnʹ shän) A range of mountains of west-central China. The highest peak is Amne Machin at 7,164.5 m (23,490 ft). * * *
—amnestic /am nes"tik/, adj. /am nee"zheuh/, n. loss of a large block of interrelated memories; complete or partial loss of memory caused by brain injury, shock, etc. [1780-90; ...
/am nee"zhee ak', -zee-/, n. 1. a person affected by amnesia. adj. 2. Also, amnesic /am nee"sik, -zik/. displaying the symptoms of amnesia. [1910-15; AMNESI(A) + -AC, after such ...
See amnesiac. * * *
See amnesiac. * * *
/am"neuh stee/, n., pl. amnesties, v., amnestied, amnestying. n. 1. a general pardon for offenses, esp. political offenses, against a government, often granted before any trial ...
Amnesty International
an independent worldwide organization working against human-rights violations and for the release of persons imprisoned for political or religious dissent; Nobel peace prize ...
Amnesty International (AI)
International human-rights organization. It was founded in 1961 by Peter Benenson, a London lawyer who organized a letter-writing campaign calling for amnesty for "prisoners of ...
am·ni·a (ămʹnē-ə) n. A plural of amnion. * * *
/am"nee oh'/, n., pl. amnios. Informal. amniocentesis. [1985-90; by shortening] * * *
/am'nee oh sen tee"sis/, n., pl. amniocenteses /-seez/. a surgical procedure for obtaining a sample of amniotic fluid from the amniotic sac in the uterus of a pregnant woman by ...
/am'nee og"reuh fee/, n., pl. amniographies. an x-ray examination of the amniotic sac after the injection of an opaque solution, performed to permit visualization of the ...
/am"nee euhn/, n., pl. amnions, amnia /-nee euh/. 1. Anat., Zool. the innermost of the embryonic or fetal membranes of reptiles, birds, and mammals; the sac in which the embryo ...
See amniotic. * * *
See amnioscopy. * * *
am·ni·os·co·py (ăm'nē-ŏsʹkə-pē) n. pl. am·ni·os·co·pies Examination of the amniotic cavity and fetus using an optical instrument that is inserted directly into ...
▪ animal group   a group of limbed vertebrates (vertebrate) that includes all living reptiles (reptile) (class Reptilia), birds (bird) (class Aves), mammals (mammal) (class ...
/am"nee oht'/, n. any vertebrate of the group Amniota, comprising the reptiles, birds, and mammals, characterized by having an amnion during the embryonic stage. Cf. anamniote. [ ...
/am'nee ot"ik/, adj. Anat., Zool. of, pertaining to, or having an amnion. Also, amnionic /am'nee on"ik/, amnic /am"nik/. [1815-25; AMNI(ON) + -OTIC] * * *
amniotic fluid
Anat., Zool. the watery fluid in the amnion, in which the embryo is suspended. * * *
/am'oh bahr"bi tal', -tawl'/, n. Pharm. a colorless, crystalline barbiturate, C11H18N2O3, used chiefly as a sedative. [1945-50; AM(YL) + -o- + BARBITAL] * * *
Amoco Corporation
▪ American company formerly (1889–1985)  Standard Oil Company (Indiana),         American petroleum corporation that was founded in 1889 by the Standard Oil trust ...
amodiaquin [am΄ō dī′əkwin΄, am΄ō dī′əkwēn΄am΄ōdī′ə kwin΄] n. 〚am(in)o-di(hydrochloride) + -a- + quin(olin)e〛 a compound, C20H22ClN3O, whose ...
/euh mee"beuh/, n., pl. amoebas, amoebae /-bee/. ameba. * * * One-celled protozoan that can form temporary extensions of cytoplasm (pseudopodia) in order to move about. Some ...
/am'euh bee"euhn/, adj. Pros. alternately responsive, as verses in dialogue. Also, amoebean. [1650-60; < L amoebae(us) antiphonal ( < Gk amoibaîos interchanging, equiv. to ...
am·oe·be·an or am·oe·bae·an (ăm'ə-bēʹən) adj. Answering alternately in prosody.   [From Late Latin amoebaeus, from Greek amoibaios, from amoibē, change. See ...
/am'euh buy"euh sis/, n. Pathol. amebiasis. * * *
/euh mee"bik/, adj. amebic. * * *
amoebic dysentery
amoebic dysentery n. alt. sp. of AMEBIC DYSENTERY * * *
amoebic dysentery n. Variant of amebic dysentery. * * *
/euh mee"beuh suyt'/, n. amebocyte. * * *
—amoeboidism, n. /euh mee"boyd/, adj. ameboid. * * *
      (Sanskrit: “Unfailing Success”), in Mahāyāna and Vajrayāna (Tantric) Buddhism, one of the five “self-born” Buddhas. See Dhyāni-Buddha. * * *
/euh muk", euh mok"/, n. 1. (among members of certain Southeast Asian cultures) a psychic disturbance characterized by depression followed by a manic urge to murder. adv. 2. run ...
▪ Iran also spelled  Amul   town, northern Iran, on the Harhāz River. The exact date of the founding of the town is unknown and enshrouded in legend, but it is certain ...
/euh moh"lay/; Sp. /ah maw"le/, n., pl. amoles /-layz/; Sp. /-les/. Southwestern U.S. 1. the root of any of several plants, as Mexican species of agaves, used as a substitute for ...
/ah"meuhn/, n. Egyptian Myth. Amen. * * * or Amen Egyptian deity revered as king of the gods. Amon may have originated as a local deity at Khmun in Middle Egypt. His cult ...
/ah"meuhn rah"/, n. Egyptian Myth. Amen-Ra. * * *
Amon-Re [ä′mənrä′ä′mən rā′] n. 〚Egypt ymn-rʾ < Amun + rʾ, sun〛 the ancient Egyptian sun god: also Amon-Ra [ä′mənrä′] * * *
/euh mung"/, prep. 1. in, into, or through the midst of; in association or connection with; surrounded by: He was among friends. 2. in the midst of, so as to influence: ...
/euh mungst", euh mungkst"/, prep. Chiefly Brit. among. [1200-50; earlier amongs, ME amonges, equiv. to among AMONG + -es adv. gen. suffix; excrescent -t as in AGAINST] * * *
/euh mon'tl ah"doh, -tee ah"-/; Sp. /ah mawn'tee lyah"thaw, -yah"dhaw/, n. a pale, dry Spanish sherry. [1815-25; < Sp, equiv. to a to, near ( < L ad) + Montill(a) (see MONTILLA) ...
Amontons, Guillaume
▪ French physicist born Aug. 31, 1663, Paris, France died Oct. 11, 1705, Paris       French physicist and inventor of scientific instruments, best known for his work on ...
/ay"mawr/, n. Cupid. [ < L: love; see AMOROUS] * * *
Amor asteroid
Astron. one of a small group of asteroids whose orbits approach but do not cross that of the earth: named after the first such asteroid discovered (1932). Cf. Apollo asteroid. * ...
amor patriae
/ah"mohrdd pah"trddee uy'/; Eng. /ay"mawr pay"tree ee'/, Latin. love of one's country; patriotism. * * *
amor vincit omnia
amor vincit omnia [ä′môr΄ vin′chit ôm′nē ä΄; ä′môr΄vin′sitôm′nē ä΄, ä′môr΄viŋk′itôm′nē ä΄] 〚L〛 love conquers everything * * *
/euh mawr"euh, euh mohr"euh/, n., pl. amoraim /ah'maw rah"im, ah'moh-/. (often cap.) Judaism. one of a group of Jewish scholars, active in the rabbinical academies of Palestine ...
—amoralism, n. —amorality /ay'meuh ral"i tee, am'euh-/, n. —amorally, adv. /ay mawr"euhl, a mawr"-, ay mor"-, a mor"-/, adj. 1. not involving questions of right or wrong; ...
See amoral. * * *
See amoralism. * * *
See amoralism. * * *
Ancient Mystic Order Rosae Crucis. See under Rosicrucian (def. 2). * * *
/am'euh ret"oh/; It. /ah'maw rddet"taw/, n., pl. amoretti /-ret"ee/; It. /-rddet"tee/. a little cupid. [1590-1600; < It, equiv. to amor(e) love ( < L amorem, acc. of amor) + ...
Amorgós Island
▪ island, Greece modern Greek  Nísos Amorgós,         island trending northeast-southwest in the Cyclades (Kikládhes) group of the Greek Aegean Islands. For the ...
/am'euh ree"noh/; It. /ah'maw rddee"naw/, n., pl. amorini /-nee/. Fine Arts. a putto represented as an infant cupid. [1855-60; < It, equiv. to amor(e) love (see AMORETTO) + -ino ...
—amoristic, adj. /am"euhr ist/, n. 1. a person who is devoted to love and lovemaking. 2. a person who writes about love. [1575-85; < L amor love + -IST] * * *
/am"euh ruyt'/, n. 1. a member of one of the principal tribes, or nations, of Canaan before its conquest by the Israelites. II Sam. 12:26-31. 2. the Semitic language of the ...
Amorite language
      one of the most ancient of the archaic Semitic languages, which are part of the Afro-Asiatic language (Afro-Asiatic languages) phylum. Amorite was spoken in an area ...
/ah'meuh roh"soh/; Sp. /ah'maw rddaw"saw/, n. a medium dry sherry of Spain. [1610-20; < Sp: AMOROUS] * * *
Amoroso Lima, Alceu
▪ Brazilian essayist, philosopher, and literary critic pseudonym  Tristão de Athayde   born Dec. 11, 1893, Rio de Janeiro, Brazil died Aug. 15, 1983, Rio de ...
—amorously, adv. —amorousness, amorosity /am'euh ros"i tee/, n. /am"euhr euhs/, adj. 1. inclined or disposed to love, esp. sexual love: an amorous disposition. 2. showing or ...
See amorous. * * *
See amorously. * * *
/euh mawr"fiz euhm/, n. 1. the state or quality of being amorphous. 2. Obs. nihilism (def. 3). [1850-55; < G Amorphismus < Gk ámorph(os) AMORPHOUS + -ismos -ISM] * * *
—amorphously, adv. —amorphousness, n. /euh mawr"feuhs/, adj. 1. lacking definite form; having no specific shape; formless: the amorphous clouds. 2. of no particular kind or ...
amorphous solid
▪ physics Introduction       any noncrystalline solid in which the atoms and molecules are not organized in a definite lattice pattern. Such solids include glass, ...
See amorphous. * * *
See amorphously. * * *
/euh mawrt"/, adj. Archaic. spiritless; lifeless. [1580-90; < F à mort at (the point of) death. See A-5, MORT] * * *
amortization. * * *
amortise [am′ər tīz΄, ə môr′tīz΄] vt. amortised, amortising chiefly Brit. sp. of AMORTIZE * * *
See amortize. * * *
/am'euhr teuh zay"sheuhn, euh mawr'-/, n. 1. an act or instance of amortizing a debt or other obligation. 2. the sums devoted to this purpose. Also, amortizement. [1665-75; < ML ...
—amortizable, adj. /am"euhr tuyz', euh mawr"tuyz/, v.t., amortized, amortizing. 1. Finance. a. to liquidate or extinguish (a mortgage, debt, or other obligation), esp. by ...
/am'euhr tuyz"meuhnt, euh mawr"tiz-/, n. 1. a sloping top on a buttress, pillar, etc. 2. an architectural feature, as a gable, at the top of a façade. 3. amortization. Also, ...
/ay"meuh ree/, n. a male or female given name. * * *
Amory, Cleveland
▪ 1999       American writer and animal rights advocate (b. Sept. 2, 1917, Nahant, Mass.—d. Oct. 14, 1998, New York, N.Y.), was the author of a number of best-selling ...
Amory, Thomas
▪ British author born 1691? died Nov. 25, 1788, London, Eng.?  British writer of Irish descent, best known for his extravagant “autobiography,” The Life of John Buncle, 2 ...
/ay"meuhs/, n. 1. a Minor Prophet of the 8th century B.C. 2. a book of the Bible bearing his name. 3. a male given name: from a Hebrew word meaning "burden." * * * I flourished ...
Amos, Book of
▪ Old Testament       the third of 12 Old Testament books that bear the names of the Minor Prophets, collected in one book under the Jewish canon titled The Twelve. ...
Amos, Valerie Ann, Baroness Amos of Brondesbury
▪ British politician born March 13, 1954, British Guiana [now Guyana]    British politician, the first woman of African descent to serve in a British cabinet and as leader ...
/am"euh suyt'/, n. Mineral. an asbestine variety of anthophyllite, rich in iron, formerly used as a heat-resistant material. [1915-20; A(sbestos) M(ine) o(f) S(outh Africa) + ...
/euh mownt"/, n. 1. the sum total of two or more quantities or sums; aggregate. 2. the sum of the principal and interest of a loan. 3. quantity; measure: a great amount of ...
amount at risk
Insurance. the difference between the reserve of a life-insurance policy and its face amount. * * *
/euh moor"/, n. 1. a love affair. 2. an illicit or secret love affair. [1250-1300; ME < MF, OF amo(u)r, repr. a dial. form or < OPr < L amorem acc. of amor love, equiv. to ...
/ann moohrdd prddaw"prddeu/, n. French. self-esteem; self-respect. [lit., self-love] * * *
/am ok'seuh sil"in, euh mok'-/, n. Pharm. a semisynthetic penicillin, C18H19N3O5S, taken orally as a broad-spectrum antibiotic. [1970-75; perh. am(ino-hydr)ox(yphenyl) part of ...
/ah moy", am"oy/, n. 1. Xiamen. 2. a Fukienese dialect spoken in and around Xiamen, as well as on Taiwan and Hainan. * * * ▪ China Wade-Giles romanization  Hsia-men,  Pinyin ...
amp1 /amp/, n. Elect. ampere. [1885-90; by shortening] amp2 /amp/, n. Informal. amplifier. [1960-65; by shortening] amp3 /amp/, n. Slang. 1. amputation. 2. amputee. [by ...
Biochem. a white, crystalline, water-soluble nucleotide, C10H12N5O3H2PO4, obtained by the partial hydrolysis of ATP or of ribonucleic acid, yielding on hydrolysis adenine, ...
Elect. ampere-hour. Also, amp. hr. * * *
Elect. 1. amperage. 2. ampere; amperes. * * *
Academy of Motion Picture Arts and Sciences. * * *
/am'peuh lop"sis/, n. any climbing, woody vine or shrub belonging to the genus Ampelopsis, of the grape family, having small greenish flowers and inedible berries. [1803; < NL < ...
/am"peuh los'/, n. Class. Myth. a satyr who was placed among the stars by Dionysus. * * *
/am"peuhr ij, am pear"-/, n. Elect. the strength of an electric current measured in amperes. Abbr.: amp. [1890-95; AMPERE + -AGE] * * *
/am"pear, am pear"/, n. Elect. the base SI unit of electrical current, equivalent to one coulomb per second, formally defined to be the constant current which if maintained in ...
—Amperian /am pear"ee euhn, -per"-/, adj. /am"pear/; Fr. /ahonn perdd"/, n. André Marie /ahn"dray meuh ree"/; Fr. /ahonn drdday" mann rddee"/, 1775-1836 French physicist. * * ...
Ampère's law
Physics. the law that a magnetic field induced by an electric current is, at any point, directly proportional to the product of the current intensity and the length of the ...
Ampère, André Marie
born Jan. 22, 1775, Lyon, France died June 10, 1836, Marseille French physicist, founder of the science of electromagnetism. A prodigy who mastered the entire known field of ...
Ampère, André-Marie
▪ French physicist Introduction born Jan. 22, 1775, Lyon, France died June 10, 1836, Marseille  French physicist who founded and named the science of electrodynamics, now ...
Ampère, AndréMarie
Am·père (ămʹpîr, äɴ-pĕrʹ), André Marie. 1775-1836. French physicist and mathematician who formulated Ampère's law, a mathematical description of the magnetic field ...
Ampère, Jean-Jacques
▪ French historian born Aug. 12, 1800, Lyon, France died March 27, 1864, Pau       French historian and philologist who initiated important studies of the diverse ...
/am"pear oweuhr", -ow"euhr, am pear"-/, n. Elect. a unit of electric charge noting the amount of electricity transferred by a current of one ampere in one hour, equal to 3600 ...
/am"pear terrn', am pear"-/, n. Elect. 1. one complete convolution of a conducting coil, through which one ampere of current passes. 2. the magnetomotive force produced by one ...
/am'pear euh me"trik, am pear'euh-/, adj. Elect. pertaining to or involving the measurement of an electric current. [1940-45; AMPERE + -O- + METRIC1] * * *
amperometric titration
Chem. titration in which the end point is determined by measuring the amperage of an electric current of given voltage that is passed through the solution. [1940-45] * * *
/am"peuhr sand', am'peuhr sand"/, n. a character or symbol for and: Smith & Jones, Inc. [1820-30; contr. of and per se and lit., (the symbol) & by itself (stands for) and; see ...
/am fet"euh meen', -min/, n. Pharm. a racemic drug, C9H13N, that stimulates the central nervous system: used chiefly to lift the mood in depressive states and to control the ...
➡ drugs * * *
a prefix occurring in loanwords from Greek (amphibious); on this model, used with the meaning "two," "both," "on both sides," in the formation of compound words: amphiaster. [ < ...
/am'fee euh ray"euhs/, n. Class. Myth. a hero who joined the Seven against Thebes, although he knew that his death was fated: deified after death. * * *
—amphiarthrodial, adj. /am'fee ahr throh"sis/, n., pl. amphiarthroses /-seez/. Anat. a joint permitting only slight motion, as that between the vertebrae. [1830-40; AMPHI- + Gk ...
/am"fee as'teuhr/, n. Cell Biol. the achromatic spindle with two asters that forms during mitosis. [1880-85; AMPHI- + -ASTER2] * * *
/am fib"ee euh/, n. the class comprising the amphibians. [1600-10; < NL < Gk amphíbia (zôia) (animals) living a double life, neut. pl. of AMPHÍBIOS. See AMPHIBIOUS] * * *
/am fib"ee euhn/, n. 1. any cold-blooded vertebrate of the class Amphibia, comprising frogs and toads, newts and salamanders, and caecilians, the larvae being typically aquatic, ...
/am'feuh buy ot"ik/, adj. Zool. living on land during the adult stage and in water during a larval stage. [AMPHI- + BIOTIC] * * *
—amphibiously, adv. —amphibiousness, n. /am fib"ee euhs/, adj. 1. living or able to live both on land and in water; belonging to both land and water. 2. Also, amphibian. ...
amphibious vehicle
▪ transportation       device for transporting personnel and equipment, usually military, that can operate as a wheeled or tracked vehicle on land and as a boat in ...
amphibious warfare
Military operations directed against hostile shores and characterized by attacks launched from the sea by naval and landing forces. It has been conducted since ancient times. ...
See amphibious. * * *
See amphibiously. * * *
/am"feuh bohl'/, n. Mineral. any of a complex group of hydrous silicate minerals, containing chiefly calcium, magnesium, sodium, iron, and aluminum, and including hornblende, ...
amphibole asbestos
Collective term for three highly fibrous (asbestiform) varieties of amphibole: crocidolite, amosite, and actinolite. All have long, silky to splintery fibres with appreciable ...
▪ Table Amphiboles name colour lustre Mohs hardness specific gravity actinolite colourless to gray; darkens with increased Fe through green to black silky; ...
/am'feuh bol"ik/, adj. equivocal; uncertain; changing; ambiguous. [1850-55; AMPHIBOL(Y) + -IC] * * *
—amphibolitic /am fib'euh lit"ik/, adj. /am fib"euh luyt'/, n. Petrog. a metamorphic rock composed mainly of amphibole and plagioclase. [1825-35; AMPHIBOLE + -ITE1] * * ...
amphibolite facies
One of the major divisions of the mineral facies classification of metamorphic rocks, encompassing rocks that formed under conditions of moderate to high temperatures (950°F, or ...
See amphibolite. * * *
—amphibological /am fib'euh loj"i keuhl/, adj. —amphibologically, adv. /am'feuh bol"euh jee/, n., pl. amphibologies. amphiboly. [1325-75; ME amphibologie < LL amphibologia. ...
/am fib"euh leuhs/, adj. ambiguous or equivocal, esp. when due to the uncertain grammatical construction of a word or phrase. [1635-45; < L amphibolus < Gk amphíbolos thrown on ...
/am fib"euh lee/, n., pl. amphibolies. ambiguity of speech, esp. from uncertainty of the grammatical construction rather than of the meaning of the words, as in The Duke yet ...
—amphibrachic, adj. /am"feuh brak'/, n. Pros. a trisyllabic foot, the arrangement of the syllables of which is short, long, short in quantitative meter, or unstressed, ...
/am'fi kahr"peuhs/, adj. Bot. producing two kinds of fruit that differ either in form or in time of ripening. Also, amphicarpic. [1865-70; AMPHI- + -CARPOUS] * * *
/am'feuh see"leuhs/, adj. Anat., Zool. concave on both sides, as the bodies of the vertebrae of fishes. Also, amphicoelous. [1865-70; < Gk amphíkoilos hollow at both ends. See ...
/am'fi kroh"ik/, adj. Chem. giving either of two colors, one with acids and one with alkalis. Also, amphichromatic /am'fi kroh mat"ik, -kreuh-/. [1875-80; AMPHI- + -CHROIC] * * *
amphicoelous [am΄fi sē′ləs] adj. 〚Gr amphikoilos < amphi-, AMPHI- + koilos, hollow: see CAVE〛 concave on both sides, as the vertebrae of certain fishes * * *
/am fik"tee euhn/, n. a deputy to the council of an amphictyony. [1580-90; back formation from amphictyons < Gk amphiktýones, orig. amphiktíones neighbors, equiv. to amphi- ...
/am fik"tee euhn/, n. Class. Myth. a son of Deucalion and Pyrrha who seized the throne of Attica and who, in devising a plan for avoiding disputes at his council meetings, became ...
/am fik'tee on"ik/, adj. of or pertaining to an amphictyon or an amphictyony. [1745-55; < Gk amphiktyonikós. See AMPHICTYON, -IC] * * *
/am fik"tee euh nee/, n., pl. amphictyonies. (in ancient Greece) any of the leagues of states, esp. the league at Delphi, united for mutual protection and the worship of a common ...
/am fid"euh meuhs/, n. Class. Myth. 1. a son of Aleus who, with his brother Cepheus, joined the Argonauts. 2. (in the Iliad) a king of Cythera. * * *
/am'fi dip"loyd/, n. Biol. a plant having the sum of the chromosome numbers of two parental species, owing to the doubling of the chromosomes in a hybrid of two ...
See amphidiploid. * * *
/am'fi droh"mee euh/, n. a family festival in ancient Athens in honor of the birth of a child, during which the child received its name. [ < Gk, equiv. to amphídrom(os) running ...
amphidromic point
/am"fi drom"ik, am'-/, Oceanog. a point of almost zero tidal fluctuation on the ocean surface, represented on a chart of cotidal lines by a point from which these lines ...
—amphigenously, adv. /am fij"euh neuhs/, adj. (of certain parasitic fungi) growing on both sides of leaves. [1825-35; AMPHI- + -GENOUS] * * *
—amphigoric /am'feuh gawr"ik, -gor"-/, adj. /am"fi gawr'ee, -gohr'ee/, n., pl. amphigories. a meaningless or nonsensical piece of writing, esp. one intended as a parody. Also, ...
/am"fi goor'ee/, n., pl. amphigouris. amphigory. * * *
—amphikaryotic, adj. /am'fi kar"ee on', -ee euhn/, n. Biol. a diploid nucleus. Cf. hemikaryon. [AMPHI- + Gk káryon nut] * * *
/am fil"euh keuhs/, n. Class. Myth. a seer, the son of Amphiaraus and Eriphyle, and the brother of Alcmaeon. * * *
/am fim"euh seuhr/, n. Pros. a trisyllabic foot, the arrangement of the syllables of which is long, short, long in quantitative meter, or stressed, unstressed, stressed in ...
/am fim"euhr euhs/, n. Class. Myth. a son of Poseidon, sometimes believed to be the father, by Urania, of the poet Linus. * * *
See amphimixis. * * *
—amphimictic /am'feuh mik"tik/, adj. —amphimictically, adv. /am'feuh mik"sis/, n., pl. amphimixes /-mik"seez/. 1. Biol. the merging of the nuclei of the sperm and egg cells; ...
/am fin"euh mee'/, n. Class. Myth. a maiden who, along with her sister Evadne, was deceived by Medea into murdering their father, Pelias. * * *
/am fin"euh meuhs/, n. (in the Odyssey) Penelope's favorite suitor. * * *
—Amphionic /am'fuy on"ik, -fee-/, adj. /am fuy"euhn, am"fee-/, n. Class. Myth. a son of Antiope by Zeus, and the husband of Niobe. With his twin brother, Zethus, he built the ...
Amphion and Zethus
In Greek mythology, twin sons of Zeus by the mortal Antiope. As infants the two were left to die on Mount Cithaeron, but were found and raised by a shepherd. Amphion grew up to ...
/am'fee ok"seuhs/, n., pl. amphioxi /-ok"suy/, amphioxuses. Zool. lancelet. [1830-40; < NL: lit., sharp at both ends < Gk amphi- AMPHI- + oxýs pointed] * * * or lancelet Any ...
/am'feuh path"ik/, adj. Chem. (of a molecule) having two different affinities, as a polar end that is attracted to water and a nonpolar end that is repelled by it. [1970-75; ...
—amphiphilic /am'feuh fil"ik/, adj. /am"feuh fuyl'/, n. Biochem. any of many organic compounds, as a surfactant, detergent, bile salt, or phospholipid, composed of hydrophilic ...
am·phi·phil·ic (ăm'fə-fĭlʹĭk) adj. Of or relating to a molecule having a polar, water-soluble group attached to a nonpolar, water-insoluble hydrocarbon chain. * * *
/am"feuh ployd'/, n. a hybrid organism having a diploid set of chromosomes from each parental species. [1940-45; AMPHI- + -PLOID] * * *
/am"feuh pod'/, n. 1. any of numerous small, flat-bodied crustaceans of the group Amphipoda, including the beach fleas, sand hoppers, etc. adj. 2. of or pertaining to the ...
Ancient city, eastern Macedonia, near the mouth of the Struma River. Amphipolis was a strategic transportation centre, controlling the bridge over the river and the route from ...
—amphiprostylar, adj. /am fip"reuh stuyl', am'feuh proh"stuyl/, adj. (of a classical temple) prostyle on both fronts. [1700-10; < L amphiprostylus < Gk amphipróstylos. See ...
—amphisbaenian, amphisbaenic, amphisbaenoid, amphisbaenous, adj. /am'feuhs bee"neuh/, n., pl. amphisbaenae /-nee/, amphisbaenas. 1. any of numerous worm lizards of the genus ...
amphisbaenian [am΄fis bē′nē ən] n. 〚< ModL: see AMPHISBAENA〛 any of a legless, burrowing suborder (Amphisbaenia) of tropical reptiles (order Squamata) with a head and ...
See amphisbaena. * * *
/am fish"ee euhnz, -fish"euhnz/, n.pl. Archaic. inhabitants of the tropics. Also, amphiscii /am fish"ee uy'/. [1615-25; < ML Amphisci(i) ( < Gk amphískioi, pl. of AMPHÍSKIOS ...
▪ Greece Modern Greek  Ámfissa         agricultural centre, chief town of the eparkhía (eparchy) of Parnassus (Parnassós), capital of the nomós (department) of ...
/am'feuh stuy"leuhr/, adj. Archit. 1. (of a classical temple) having columns on both fronts. 2. having columns at both sides. [1900-05; AMPHI- + Gk styl(os) pillar + -AR1] * * *
/am'feuh thal"euh meuhs/, n., pl. amphithalami /-muy'/. (in an ancient Greek house) a room adjoining the thalamus. [ < L < Gk amphithálamos. See AMPHI-, THALAMUS] * * *
—amphitheatric /am'feuh thee a"trik/, amphitheatrical, adj. —amphitheatrically, adv. /am"feuh thee'euh teuhr, -theeeu'teuhr/, n. 1. an oval or round building with tiers of ...
▪ architecture also spelled  amphitheater        freestanding building of round or, more often, oval shape with a central area, the arena, and seats concentrically ...
See amphitheater. * * *
See amphitheatric. * * *
See amphitheatric. * * *
—amphithecial /am'feuh thee"sheuhl, -shee euhl, -see euhl/, adj. /am'feuh thee"shee euhm/, n., pl. amphithecia /-shee euh/. 1. Bot. the layer or one of the layers of cells in ...
/am fith"euh mis/, n. Class. Myth. a son of Apollo and Acacallis. * * *
▪ extinct mammals       extinct genus of early mammals known as fossils from Middle Jurassic deposits (of 176 million to 161 million years ago). Amphitherium is the ...
/am'feuh thoor"on/, n., pl. amphithura /-thoor"euh/, amphithurons. amphithyra (def. 1). * * *
/ahm fee"thee rddah/; Eng. /am fith"euhr euh/, n., pl. amphithyra. 1. Also, amphithyron, amphithura /am'feuh thoor"euh/, amphithuron. Gk. Orth. Ch. a divided curtain in front of ...
/ahm fee"thee rddawn/; Eng. /am fith"euh ron'/, n., pl. amphithyra /-fee"thee rddah/; Eng. /-fith"euhr euh/, amphithyrons. amphithyra (def. 1). Also, amphithuron. * * *
/am fi"tri kit/, adj. (of bacteria) having a single flagellum at each end. Also, amphitrichous. [ < Gk amphi- AMPHI- + trich- (s. of thríx hair) + -ATE1] * * *
/am'fi truy"tee/, n. an ancient Greek sea goddess, a daughter of Nereus and the wife of Poseidon. * * * ▪ Greek mythology  in Greek mythology, the goddess of the sea, wife ...
/am fi"treuh peuhs/, adj. Bot. (of an ovule) inverted so that the funicle is in the middle of one side. [1835-45; AMPHI- + -TROPOUS] * * *
/am fi"trooh oh'/, n. a comedy (c200 B.C.) by Plautus. * * *
/am fi"tree euhn/, n. Class. Myth. the husband of the virtuous Alcmene, whom Zeus seduced by assuming the form of Amphitryon, resulting in the birth of Hercules. * * * ▪ ...
Amphitryon 38
a play (1938) by Jean Giraudoux. * * *
/am'fee yooh"meuh/, n. an aquatic, eellike salamander of the genus Amphiuma, of the southeastern U.S., having two pairs of very small feet. [ < NL Amphiuma name of the genus, ...
—amphogeny /am foj"euh nee/, n. /am'feuh jen"ik/, adj. Biol. producing both male and female offspring. Also, amphogenous /am foj"euh neuhs/. [ampho- ( < Gk ampho-; see AMPHI-) ...
/am"feuh luyt'/, n. Chem. an ampholytic substance. [AMPHO(TERIC) + (ELECTRO)LYTE] * * *
/am'feuh lit"ik/, adj. Chem. capable of ionizing into both anions and cations; amphoteric. [AMPHOLYTE + -IC] * * *
—amphoral, adj. /am"feuhr euh/, n., pl. amphorae /-feuh ree'/, amphoras. Gk. and Rom. Antiq. a large two-handled storage jar having an oval body, usually tapering to a point at ...
See amphora. * * *
—amphoricity /am'feuh ris"i tee/, n. /am fawr"ik, -for"-/, adj. resembling the deep, hollow sound made by blowing across the mouth of a large, narrow-necked, empty bottle: ...
/am'feuh ris"keuhs/, n., pl. amphoriskoi /-koy/. Gk. and Rom. Antiq. a miniature amphora. [ < Gk, equiv. to amphor(eús) AMPHORA + -iskos dim. suffix] * * *
/am'feuh ter"ik/, adj. Chem. capable of functioning either as an acid or as a base. [1840-50; < Gk amphóter(os) (comp. of ámpho both; c. L ambo) + -IC] * * *
/am'feuh ter"euh sin/, n. Pharm. an amphoteric antibiotic produced by the bacterium Streptomyces nodosus and used in the treatment of fungal infections. [1950-55; AMPHOTERIC + ...
amphotericin B
amphotericin B [am΄fə ter′ə sin] n. 〚 AMPHOTERIC + -IN1〛 an antibiotic compound, C46H73NO20, used in treating certain diseases caused by parasitic fungi, such as ...
am·pho·ter·i·cin B (ăm'fə-tĕrʹĭ-sĭn) n. An antibiotic derived from strains of the actinomycete Streptomyces nodosus and used specifically in treating systemic fungal ...
▪ chemistry       in chemistry, reactivity of a substance with both acids and bases, acting as an acid in the presence of a base and as a base in the presence of an ...
amp hr abbr. ampere-hour. * * *
/am'peuh sil"in/, n. Pharm. a broad-spectrum semisynthetic penicillin, C16H19N3O4S, effective against certain susceptible Gram-positive and Gram-negative bacteria. [1965-70; ...
—ampleness, n. /am"peuhl/, adj., ampler, amplest. 1. fully sufficient or more than adequate for the purpose or needs; plentiful; enough: an ample supply of water; ample time to ...
Ampleforth College
a Roman Catholic public school for boys in Yorkshire in the north of England. It was set up in 1802. * * *
See ample. * * *
/am plek"si kawl'/, adj. Bot. clasping the stem, as some leaves do at their base. [1750-60; < NL amplexicaulis, equiv. to L amplex(us) embrace (see AMPLEXUS) + -i- -I- + caulis ...
/am'plek seuh foh"lee it, -ayt', am plek'-/, adj. Bot. having amplexicaul leaves. [1875-80; amplexi- (see AMPLEXICAUL) + FOLIATE] * * *
/am plek"seuhs/, n., pl. amplexuses, amplexus. the clasping posture of fertilization in frogs and toads. [1925-30; < NL, L: embrace, equiv. to amplect(i) to embrace (am-, var. of ...
/am"plee it, -ayt'/, adj. enlarged; dilated. [1505-15; < L ampliatus extended (ptp. of ampliare). See AMPLE, -I-, -ATE1] * * *
/am'plee ay"sheuhn/, n. Archaic. an enlarging or extending; amplification. [1500-10; < L ampliation- (s. of ampliatio) an extending. See AMPLIATE, -ION] * * *
/am"pli duyn'/, n. Elect. a direct-current generator with a rotating armature, capable of magnifying a small amount of power supplied to the field winding of the device and using ...
/am'pleuh fi kay"sheuhn/, n. 1. the act of amplifying or the state of being amplified. 2. expansion of a statement, narrative, etc., as for rhetorical purposes: In the revision, ...
/am plif"i keuh tawr'ee, -tohr'ee/, adj. of the nature of enlargement or extension, as of a statement, narrative, etc. [1840-50; < L amplifica(re) to increase (see AMPLIFY) + ...
/am"pleuh fuy'euhr/, n. 1. a person or thing that amplifies or enlarges. 2. an electronic component or circuit for amplifying power, current, or voltage. [1540-50; AMPLIFY + ...
—amplifiable, adj. /am"pleuh fuy'/, v., amplified, amplifying. v.t. 1. to make larger, greater, or stronger; enlarge; extend. 2. to expand in stating or describing, as by ...
/am"pli toohd', -tyoohd'/, n. 1. the state or quality of being ample, esp. as to breadth or width; largeness; greatness of extent. 2. large or full measure; abundance; ...
amplitude modulation
Electronics, Radio. See AM. [1920-25] * * *       variation of the amplitude of a carrier wave (commonly a radio wave) in accordance with the characteristics of a signal, ...

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