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metazoal
See metazoan. * * *
metazoan
metazoan [met΄ə zō′ən] n. 〚< ModL Metazoa (
metazoic
See metazoal. * * *
Metcalf, Joseph, III
▪ 2008       vice admiral (ret.), U.S. Navy born Dec. 20, 1927 , Holyoke, Mass. died March 2, 2007, Washington, D.C. commanded the full-scale U.S. military invasion of ...
Metcalfe (of Fern Hill), Charles T(heophilus) Metcalfe, Baron, 2nd Baronet
▪ British colonial official born January 30, 1785, Calcutta died September 5, 1846, Malshanger, Hampshire, England       British overseas administrator who, as acting ...
Metcalfe, E. Bennett
▪ 2004 “Ben”        Canadian environmentalist, journalist, and broadcaster (b. Oct. 31, 1919, Winnipeg, Man.—d. Oct. 14, 2003, Shawnigan Lake, Vancouver Island, ...
Metcalfe, Ralph
▪ American athlete in full  Ralph Harold Metcalfe   born May 30, 1910, Atlanta, Ga., U.S. died Oct. 10, 1978, Chicago, Ill.  American sprinter, member of the American 4 × ...
Metchnikoff
/mech'ni kawf", -kof'/; Russ. /myech"nyi keuhf/, n. Élie Fr. /ay lee"/, (Ilya Ilyich Mechnikov), 1845-1916, Russian zoologist and bacteriologist in France: Nobel prize for ...
Metchnikoff, Élie
orig. Ilya Ilich Mechnikov born May 16, 1845, near Kharkov, Ukraine, Russian Empire died July 16, 1916, Paris, France Russian zoologist and microbiologist. In 1888 Louis ...
Metchnikoff,Elie
Metch·ni·koff also Metch·ni·kov (mĕchʹnĭ-kôf', myĕchʹnĭ-kəf), Elie. 1845-1916. Russian zoologist. He shared a 1908 Nobel Prize for discoveries and advances in ...
mete
mete1 /meet/, v.t., meted, meting. 1. to distribute or apportion by measure; allot; dole (usually fol. by out): to mete out punishment. 2. Archaic. to measure. [bef. 900; ME; OE ...
Metellus Celer, Quintus Caecilius
▪ Roman politician died 59 BC       a leading Roman politician of the late 60s BC who became an opponent of Pompey the Great, the Catilinarian conspiracy (see ...
Metellus Creticus, Quintus Caecilius
▪ Roman general flourished 1st century BC       Roman general.       Consul in 69 BC, Metellus was appointed to the command of the war against Crete, the ...
Metellus Macedonicus, Quintus Caecilius
▪ Roman general and statesman died 115 BC       Roman general and statesman who was the first Roman not of noble birth to serve as consul (one of two chief magistrates) ...
Metellus Numidicus, Quintus Caecilius
▪ Roman general died c. 91 BC       Roman general during the Jugurthine War (111–105) and leader of the powerful Caecilius Metellus family, whose power had been ...
Metellus Pius Scipio, Quintus Caecilius
▪ Roman politician died 46 BC       Roman politician, a leading supporter of his son-in-law Pompey the Great in the power struggle between Pompey and Julius ...
Metellus Pius, Quintus Caecilius
▪ Roman general and statesman died c. 63 BC       Roman general and statesman who supported Lucius Cornelius Sulla (Sulla, Lucius Cornelius). He earned his surname Pius ...
Metellus, Lucius Caecilius
▪ Roman general died 221 BC       Roman general during the First Punic War (264–241 BC).       As consul in 251, Metellus decisively defeated the Carthaginian ...
metempirical
—metempirically, adv. /met'em pir"i keuhl/, adj. 1. beyond or outside the field of experience. 2. of or pertaining to metempirics. Also, metempiric. [1874; MET- + EMPIRICAL] * ...
metempirics
—metempiricist, n. /met'em pir"iks/, n. (used with a sing. v.) the philosophy dealing with the existence of things outside, or beyond, experience. Also, metempiricism. [1874; ...
metempsychosis
—metempsychic /met'euhm suy"kik/, metempsychosic, metempsychosical, adj. /meuh tem'seuh koh"sis, -temp'-, met'euhm suy-/, n., pl. metempsychoses /-seez/. the transmigration of ...
metencephalic
See metencephalon. * * *
metencephalon
—metencephalic /met'en seuh fal"ik/, adj. /met'en sef"euh lon'/, n., pl. metencephalons, metencephala /-leuh/. Anat. the anterior section of the hindbrain, comprising the ...
meteor
—meteorlike, adj. /mee"tee euhr, -awr'/, n. 1. Astron. a. a meteoroid that has entered the earth's atmosphere. b. a transient fiery streak in the sky produced by a meteoroid ...
meteor and meteoroid
▪ astronomy Introduction   respectively, a glowing streak in the sky (meteor) and its cause, which is a relatively small stony or metallic natural object from space ...
Meteor Crater
▪ crater, Arizona, United States also called  Barringer Meteorite Crater,  Coon Butte,  Arizona Meteor Crater,  or  Canyon Diablo,         rimmed, bowl-shaped pit ...
Meteor Crater.
See Crater Mound. * * *
meteor shower
Astron. the profusion of meteors observed when the earth passes through a meteor swarm. Also, meteoric shower. [1875-80] * * * Entry into Earth's atmosphere of multiple ...
meteor swarm
Astron. any large number of meteoroids moving in parallel paths. Cf. meteor shower. * * *
meteor.
1. meteorological. 2. meteorology. * * *
Metéora
▪ monasteries, Greece   group of monasteries (World Heritage site) on the summits of vertical rock formations in Thessaly, Greece. The monasteries are located just north ...
meteoric
—meteorically, adv. /mee'tee awr"ik, -or"-/, adj. 1. of, pertaining to, or consisting of meteors. 2. resembling a meteor in transient brilliance, suddenness of appearance, ...
meteoric shower
Astron. See meteor shower. [1825-35] * * *
meteorically
See meteoric. * * *
meteorite
—meteoritic /mee'tee euh rit"ik/, meteoritical, meteorital /mee'tee euh ruyt"l/, adj. /mee"tee euh ruyt'/, n. 1. a mass of stone or metal that has reached the earth from outer ...
meteorite crater
crater (def. 2). * * * Depression that results from the impact of a meteorite with a solid object in space. Impact craters have been discovered on Earth, the Moon, Mars, other ...
meteorite shower
▪ astronomy       swarm of separate but related meteorites that land on Earth's surface at about the same time and place. Meteorite showers are produced by the ...
meteoritic
See meteorite. * * *
meteoritical
See meteoritic. * * *
Meteoritical Society
▪ international scientific organization       international scientific organization that promotes research and education on meteorites and other extraterrestrial ...
meteoritics
—meteoriticist /mee'tee euh rit"euh sist/, n. /mee'tee euh rit"iks/, n. (used with a sing. v.) Astron. the science that deals with meteors. [1930-35; METEORITE + -ICS] * * ...
meteorogram
/mee'tee awr"euh gram', -or"-, mee"tee euhr euh-/, n. Meteorol. 1. a record made by a meteorograph. 2. a diagram or chart representing the pattern of recurrence of two or more ...
meteorograph
—meteorographic /mee'tee awr'euh graf"ik, -or'-, mee'tee euhr euh-/, adj. —meteorography /mee'tee euh rog"reuh fee/, n. /mee'tee awr"euh graf', -grahf', -or"-, mee"tee euhr ...
meteoroid
/mee"tee euh royd'/, n. Astron. any of the small bodies, often remnants of comets, traveling through space: when such a body enters the earth's atmosphere it is heated to ...
meteorol.
1. meteorological. 2. meteorology. * * *
meteorologic
See meteorological. * * *
meteorological
—meteorologicaly, adv. /mee'tee euhr euh loj"i keuhl/, adj. pertaining to meteorology or to phenomena of the atmosphere or weather. Also, meteorologic. [1560-70; < Gk ...
meteorological satellite
an artificial satellite that gathers data concerning the earth's atmosphere and surface in order to aid meteorologists in understanding weather patterns and producing weather ...
meteorologically
See meteorological. * * *
meteorologist
me·te·or·ol·o·gist (mē'tē-ə-rŏlʹə-jĭst) n. 1. One who studies meteorology. 2. One who reports and forecasts weather conditions. * * *
meteorology
—meteorologist, n. /mee'tee euh rol"euh jee/, n. 1. the science dealing with the atmosphere and its phenomena, including weather and climate. 2. the atmospheric conditions and ...
METEOROLOGY AND CLIMATE: What's Happening to El Nino??
▪ 1996       Most of the year-to-year variability in climate in the tropics—and much of it worldwide—is related through a phenomenon called El Niño. The term ...
meteorshower
meteor shower n. A large number of meteors that appear together and seem to come from the same area in the sky. * * *
meter
meter1 /mee"teuhr/, n. the fundamental unit of length in the metric system, equivalent to 39.37 U.S. inches, originally intended to be, and being very nearly, equal to one ...
meter maid
a female member of a police or traffic department responsible for issuing tickets for parking violations. [1955-60, Amer.] * * *
meter-candle
/mee"teuhr kan'dl/, n. lux. Abbr.: mc [1905-10] * * *
meter-candle-second
/mee"teuhr kan"dl sek"euhnd/, n. a unit of light-exposure equivalent to one lux for one second. * * *
meter-kilogram-second
/mee"teuhr kil"euh gram'sek"euhnd/, adj. of or pertaining to the system of units in which the meter, kilogram, and second are the principal units of length, mass, and time. ...
meter-kilogram-second-ampere
/mee"teuhr kil"euh gram'sek"euhnd am"pear, -am pear"/, adj. of or pertaining to the system of units in which the meter, kilogram, second, and ampere are the principal units of ...
meterage
/mee"teuhr ij/, n. 1. the practice of measuring; measurement. 2. a sum or price charged for measurement. [1880-85; METER3 + -AGE] * * *
metered mail
mail on which the postage is printed directly on an envelope or label by a machine licensed by the postal service. [1925-30] * * *
metermaid
meter maid n. A woman member of a police traffic control department who issues tickets for parking violations. * * *
metes and bounds
/meets/ the boundaries or limits of a piece of land. [1275-1325; late ME; trans. of AF metes et boundes. See METE2, BOUND3] * * * ▪ land description       limits or ...
metestrous
See metestrus. * * *
metestrus
/met es"treuhs/, n. the luteal phase of the reproductive cycle in mammalian females, occurring after ovulation and characterized by development of the corpus luteum, increased ...
metformin
met·for·min (mĕt-fôrʹmĭn) n. A oral antidiabetic agent, C4H11N5, that decreases glucose production by the liver and lowers plasma glucose levels.   [Probably methyl + ...
Metge, Bernat
▪ Spanish poet also called  Bernardo Metge   born 1350, Barcelona, Catalonia [now in Spain] died 1413, Barcelona       poet and prose writer whose masterpiece, Lo ...
meth
/meth/, n. Slang. methamphetamine; Methedrine. [by shortening] * * *
meth
/meth/, n. Slang. methamphetamine; Methedrine. [by shortening] * * *
meth-
a combining form representing methyl in compound words: methenamine. * * *
Meth.
Methodist. * * *
methacetin
/meth'euh seet"n/, n. Pharm. a white, crystalline, water-insoluble powder, C9H11NO2, used for relieving pain and reducing or preventing fever. Also called ...
methacrylate
/meth ak"reuh layt'/, n. Chem. an ester or salt derived from methacrylic acid. [1860-65; METH- + ACRYL(IC) + -ATE2] * * *
methacrylate resin
Chem. an acrylic resin formed by polymerizing the esters or amides of methacrylic acid. * * *
methacrylic acid
/meth"euh kril"ik, meth'-/, Chem. a colorless, liquid acid, C4H6O2, produced synthetically, whose methyl ester, methyl methacrylate, polymerizes to yield a clear plastic. Cf. ...
methacrylicacid
meth·a·cryl·ic acid (mĕth'ə-krĭlʹĭk) n. A colorless liquid, CH2:C(CH3)COOH, used in the manufacture of resins and plastics. * * *
methadone
/meth"euh dohn'/, n. Pharm. a synthetic narcotic, C21H28ClNO, similar to morphine but effective orally, used in the relief of pain and as a heroin substitute in the treatment of ...
methaemoglobin
/met hee"meuh gloh'bin, -hem"euh-, -hee'meuh gloh"-, -hem'euh-/, n. methemoglobin. * * *
methamphetamine
/meth'am fet"euh meen', -min/, n. Pharm. a central nervous system stimulant, C10H15N, used clinically in the treatment of narcolepsy, hyperkinesia, and for blood pressure ...
methanal
/meth"euh nal'/, n. Chem. formaldehyde. [METHANE + -AL3] * * *
methanation
/meth'euh nay"sheuhn/, n. Chem. the process of converting a mixture, as of hydrogen and carbon monoxide, into methane. [1955-60; METHANE + -ATION] * * *
methane
/meth"ayn/; Brit. /mee"thayn/, n. Chem. a colorless, odorless, flammable gas, CH4, the main constituent of marsh gas and the firedamp of coal mines, obtained commercially from ...
methane series
Chem. See alkane series. [1885-90] * * *
methaneseries
methane series n. See alkane series. * * *
methanogen
—methanogenic, adj. /me than"euh jeuhn, -jen'/, n. any of a diverse group of widely distributed archaebacteria that occur in anaerobic environments, as the intestinal tracts of ...
methanol
/meth"euh nawl', -nol'/, n. Chem. See methyl alcohol. [1890-95; METHANE + -OL1] * * * or methyl alcohol or wood alcohol Simplest of the alcohols, chemical formula CH3OH. Once ...
methantheline
/me than"theuh leen'/, n. Pharm. a compound, C21H26BrNO3, used in the form of its bromide in the treatment of excessive sweating and salivation, peptic ulcer, stomach cramps, and ...
methaqualone
/meuh thak"weuh lohn', meth'euh kway"lohn, -kwol"ohn/, n. Pharm. a nonbarbiturate sedative-hypnotic substance, C16H14N2O, used to induce sleep: also widely used as an illicit ...
Methedrine
/meth"euh dreen', -drin/, Pharm., Trademark. a brand of methamphetamine. * * *
metheglin
/meuh theg"lin/, n. a variety of spiced mead. [1525-35; < Welsh meddyglyn, equiv. to meddyg healing ( < L medicus; see MEDICAL) + llyn liquor] * * *
methemoglobin
/met hee"meuh gloh'bin, -hem"euh-, -hee'meuh gloh"-, -hem'euh-/, n. Biochem. a brownish compound of oxygen and hemoglobin, formed in the blood, as by the use of certain ...
methemoglobinemia
▪ pathology       decrease in the oxygen-carrying capacity of the red blood cells (erythrocytes (erythrocyte)) due to the presence of methemoglobin in the blood. The ...
methenamine
/me thee"neuh meen', -min/, n. Chem. hexamethylenetetramine. [1925-30; METH- + -ENE + AMINE] * * *
methicillin
/meth'euh sil"in/, n. Pharm. a semisynthetic penicillin antibiotic, C17H19N2NaO6S, used principally in the treatment of severe, penicillin-resistant staphylococci ...
methimazole
/me thim"euh zohl', -thuy"meuh-/, n. Pharm. a white crystalline substance, C4H6N2S, that inhibits thyroxin synthesis, used in the treatment of hyperthyroidism. [METH(YL) + ...
methinks
/mi thingks"/, v. impers.; pt. methought. Archaic. it seems to me. [bef. 900; ME me thinketh, OE me thyncth. See ME, THINK2, -S2] * * *
methiocarb
/me thuy"euh kahrb'/, n. Chem. a crystalline compound, C11H15NO2S, used as a nonsystemic insecticide and miticide. [ME(THYL) + THIO- + CARB(AMATE)] * * *
methionine
/me thuy"euh neen', -nin/, n. Biochem. an amino acid, CH3SCH2CH2CH(NH2)COOH, found in casein, wool, and other proteins or prepared synthetically: used as a supplement to a ...
metho-
metho- [meth′ō, meth′ə] combining form methyl [methamphetamine] * * *
methocarbamol
/meth'euh kahr"beuh mawl', -mol'/, n. Pharm. a substance, C11H15NO5, used as a muscle relaxant in combination with other drugs in the treatment of acute, painful musculoskeletal ...
method
—methodless, adj. /meth"euhd/, n. 1. a procedure, technique, or way of doing something, esp. in accordance with a definite plan: There are three possible methods of repairing ...
method acting
n [U] a way of acting in which actors try to identify completely with the characters they are playing. It was based on the ideas of the Russian director Constantin Stanislavsky, ...
method of least squares
Statistics. See least squares. * * *
methodic doubt
▪ philosophy       in Cartesian philosophy, a way of searching for certainty by systematically though tentatively doubting everything. First, all statements are ...
methodical
—methodically, adv. —methodicalness, n. /meuh thod"i keuhl/, adj. 1. performed, disposed, or acting in a systematic way; systematic; orderly: a methodical person. 2. ...
methodically
See methodical. * * *
methodicalness
See methodically. * * *
Methodism
/meth"euh diz'euhm/, n. 1. the doctrines, polity, beliefs, and methods of worship of the Methodists. 2. (l.c.) the act or practice of working, proceeding, etc., according to some ...
Methodist
—Methodistically, adv. /meth"euh dist/, n. 1. a member of the largest Christian denomination that grew out of the revival of religion led by John Wesley: stresses both personal ...
Methodist Church
➡ Methodist * * *
Methodistic
See Methodist. * * *
Methodius
/meuh thoh"dee euhs/, n. Saint (Apostle of the Slavs), A.D. c825-885, Greek missionary in Moravia (brother of Saint Cyril). * * *
Methodius I, Saint
▪ patriarch of Constantinople born 788/800, Syracuse, Sicily died June 14, 847, Constantinople [now Istanbul]; feast day June 14       patriarch of Constantinople from ...
Methodius,Saint
Me·tho·di·us (mĭ-thōʹdē-əs), Saint. See Cyril, Saint. * * *
methodization
See methodize. * * *
methodize
—methodizer, n. /meth"euh duyz'/, v.t., methodized, methodizing. 1. to reduce (something) to a method. 2. to arrange (something) according to a method. Also, esp. Brit., ...
methodizer
See methodization. * * *
methodological
See methodology. * * *
methodologically
See methodological. * * *
methodologist
meth·od·ol·o·gist (mĕth'ə-dŏlʹə-jĭst) n. One who studies methodology. * * *
methodology
—methodological /meth'euh dl oj"i keuhl/, adj. —methodologically, adv. —methodologist, n. /meth'euh dol"euh jee/, n., pl. methodologies. 1. a set or system of methods, ...
methohexital
/meth'oh hek"si tal'/, n. Pharm. a barbiturate anesthetic, used in its sodium form, C14H17N2NaO3, for induction of general anesthesia or for anesthesia of short ...
methoprene
/meth"euh preen'/, n. Chem. a synthetic insect juvenile hormone, C19H34O3, used as a biological pesticide primarily on mosquito and fly larvae to prevent maturing to the adult ...
methotrexate
/meth'oh trek"sayt/, n. Pharm. a toxic folic acid analogue, C20H22N8O5, that inhibits cellular reproduction, used primarily in the treatment of psoriasis and certain cancers and ...
methought
/mi thawt"/, v. pt. of methinks. * * *
methoxide
/meth ok"suyd, -sid/, n. Chem. methylate (def. 1). [METH- + OXIDE] * * *
methoxsalen
/me thok"seuh leuhn/, n. Pharm. a potent compound, C12H8O4, derived from the seeds of the plant Ammi majus: used in combination with certain ultraviolet radiation for the ...
methoxy
/meuh thok"see/, adj. Chem. containing the methoxy group. Also, methoxyl /meuh thok"sil/. [1895-1900; METH- + OXY-2] * * *
methoxy group
Chem. the univalent group CH3O-. Also called methoxy radical. [1895-1900] * * *
methoxy-
a combining form occurring in the names of chemical compounds in which the methoxy group is present: methoxychlor. * * *
methoxybenzene
/meuh thok'see ben"zeen, -ben zeen"/, n. Chem. anisole. [METHOXY- + BENZENE] * * *
methoxychlor
/meuh thok"si klawr', -klohr'/, n. Chem. a white, crystalline, water-insoluble solid, C16H15Cl3O2, used as an insecticide. Also called DMDT, methoxy DDT. [1945-50; METHOXY- + ...
methoxyflurane
/me thok'see floor"ayn/, n. Pharm. a potent substance, C3H4Cl2F2O, used as an analgesic in minor surgical procedures and less frequently as a general anesthetic. [1960-65; ...
meths
meths [meths] n. [Brit. Informal] short for METHYLATED SPIRITS * * *
Methuen
/meuh thooh"euhn/, n. a town in NE Massachusetts, near Lawrence. 36,701. * * *
Methuen, Paul Sanford Methuen, 3rd Baron
▪ British military officer born September 1, 1845, Corsham Court, Wiltshire, England died October 30, 1932, Corsham Court       British military commander who was ...
Methuselah
/meuh thooh"zeuh leuh, -thoohz"leuh/, n. 1. a patriarch who lived 969 years. Gen. 5:27. 2. an extremely old man. 3. a very large wine bottle holding 61/2 qt. (6 l). * * ...
methyl
—methylic /me thil"ik, meuh-/, adj. /meth"euhl/, adj. Chem. containing the methyl group. [1835-45; by back formation from METHYLENE] * * *
methyl acetate
Chem. a colorless, flammable, volatile liquid, C3H6O2, the methyl ester of acetic acid, having a fragrant odor, used chiefly as a solvent. [1900-05] * * *
methyl alcohol
Chem. a colorless, volatile, water-soluble, poisonous liquid, CH4O, obtained by the destructive distillation of wood or the incomplete oxidation of natural gas, or produced ...
methyl benzene
methyl benzene n. TOLUENE * * *
methyl bromide
Chem. a colorless, poisonous gas, CH3Br, used chiefly as a solvent, refrigerant, and fumigant and in organic synthesis. Also called bromomethane. [1900-05] * * * ▪ chemical ...
methyl cellulose
Chem. a grayish-white powder prepared from cellulose that swells to a highly viscous colloidal solution in water: used as a food additive and in water paints, leather tanning, ...
methyl chloride
Chem. a colorless, poisonous gas, CH3Cl, used chiefly as a refrigerant, as a local anesthetic, and as a methylating agent in organic synthesis. Also called ...
methyl chloroformate
/klawr'euh fawr"mit, -mayt, klohr'-/, Chem. a colorless liquid, C2H3ClO2, used chiefly in organic synthesis. Also called methyl chlorocarbonate. [CHLOROFORM + -ATE2] * * *
methyl cyanide
Chem. acetonitrile. * * *
methyl ethyl ketone
Chem. a colorless, flammable liquid, C4H8O, produced by synthesis or fermentation: used chiefly as a solvent, as a paint remover, and in the manufacture of plastics. Abbr.: MEK ...
methyl formate
Chem. a colorless, water-soluble, flammable liquid, C2H4O2, used chiefly in organic synthesis and as a solvent. * * *
methyl group
Chem. the univalent group CH3-, derived from methane. Also called methyl radical. * * * ▪ chemistry       one of the commonest structural units of organic compounds, ...
methyl isobutyl ketone
Chem. a colorless, slightly water-soluble, flammable liquid, C6H12O, having a pleasant odor: used as a solvent for nitrocellulose, gums, resins, fats, waxes, and oils. Also ...
methyl isocyanate
Chem. a highly toxic, flammable, colorless liquid, CH3NCO, used as an intermediate in the manufacture of pesticides: in 1984, the accidental release of a cloud of this gas in ...
methyl lactate
Chem. a colorless liquid, C4H8O3, soluble with water and most organic liquids: used chiefly as a solvent for cellulose acetate. * * *
methyl methacrylate
Chem. a colorless, volatile, flammable, water-insoluble, liquid, unsaturated ester, C5H8O2, that polymerizes readily to a clear plastic. Cf. Lucite, Plexiglas. [1930-35] * * *
methyl oleate
Chem. an oily, clear to amber, water-insoluble liquid, C19H36O2, used chiefly as an intermediate for detergents, wetting agents, and emulsifiers. * * *
methyl orange
Chem. an orange-yellow, slightly water-soluble powder, C14H14N3NaO3S, used chiefly as an acid-base indicator. Also called gold orange, helianthine B, orange III, tropaeolin D, ...
methyl parathion
Chem. a synthetic pesticide, C8H10NO5PS, used in the control of mites and various insects, as aphids, boll weevils, and cutworms. [1955-60] * * *
methyl phenol
Chem. cresol. * * *
methyl phenyl ether
Chem. anisole. * * *
methyl propyl ketone
Chem. a colorless, slightly water-soluble liquid, C5H10O, used chiefly as a solvent, esp. in lacquers. * * *
methyl red
Chem. a water-insoluble solid occurring as a dark-red powder or violet crystals, C15H15N3O2, used chiefly as an acid-base indicator. Cf. methyl orange. [1905-10] * * *
methyl salicylate
Chem. a colorless, water-soluble liquid, C8H8O3, produced synthetically or by maceration and subsequent distillation from birch or gaultheria: used chiefly in perfumery and ...
methyl styryl ketone
/stuy"ril, stir"euhl/, Chem. See benzylidene acetone. [STYR(ENE) + -YL] * * *
methyl sulfate
Chem. See dimethyl sulfate. [1930-35] * * *
methyl transferase
Biochem. any of a class of enzymes that catalyze the transfer of methyl groups from one molecule to another. * * *
methyl violet
methyl violet n. GENTIAN VIOLET * * *
methyl-
a combining form occurring in the names of chemical compounds in which the methyl group is present: methylamine. * * *
methylacetate
methyl acetate n. An organic compound, CH3COOCH3, used as a paint remover and general solvent and in the manufacture of perfumes. * * *
methylacetic acid
/meth"euhl euh see"tik, -euh set"ik/, Chem. See propionic acid. [1880-85; METHYL- + ACETIC ACID] * * *
methylal
/meth'euh lal", meth"euh lal'/, n. Chem. a colorless, flammable, volatile liquid, C3H8O2, having a chloroformlike odor, used chiefly as a solvent, in perfumery, and in organic ...
methylalcohol
methyl alcohol n. See methanol. * * *
methylamine
/meth'euh leuh meen", -euhl am"in/, n. Chem. any of three derivatives of ammonia in which one or all of the hydrogen atoms are replaced by methyl groups, esp. a gas, CH5N, with ...
methylate
—methylator, n. /meth"euh layt'/, n., v., methylated, methylating. Chem. n. 1. Also called methoxide. any derivative of methyl alcohol, as sodium methylate, CH3ONa. 2. any ...
methylated spirits
ethyl alcohol denatured with methyl alcohol for the purpose of preventing its use as an alcoholic beverage. Also, methylated spirit. [1860-65] * * *
methylatedspirit
meth·yl·at·ed spirit (mĕthʹə-lā'tĭd) n. A denatured alcohol consisting of a mixture of ethyl alcohol and methyl alcohol. Often used in the plural. * * *
methylation
/meth'euh lay"sheuhn/, n. Chem. the process of replacing a hydrogen atom with a methyl group. [1875-80; METHYLATE + -ION] * * *
methylator
See methylation. * * *
methylbenzene
/meth'euhl ben"zeen, -ben zeen"/, n. Chem. toluene. [METHYL- + BENZENE] * * *
methylbenzyl acetate
/meth"il ben"zil/. See methylphenylcarbinyl acetate. [1900-05; METHYL + BENZYL] * * *
methylbromide
methyl bromide n. A toxic gas, CH3Br, used as a fumigant. * * *
methylcatechol
/meth'euhl kat"euh chawl', -chol', -shawl', -shol', -kawl', -kol'/, n. Pharm. guaiacol. [METHYL- + CATECHOL] * * *
methylcellulose
meth·yl·cel·lu·lose (mĕth'əl-sĕlʹyə-lōs', -lōz') n. A powdery substance prepared synthetically by the methylation of natural cellulose and used as a food additive, a ...
methylchloride
methyl chloride n. An explosive gas, CH3Cl, used in organic synthesis and polymerization, as a refrigerant, and an anesthetic. * * *
methylcyclohexanol
/meth'euhl suy'kleuh hek"seuh nawl', -nol'/, n. Chem. a colorless, aromatic, viscous liquid mixture, chiefly of the ortho and para forms of CH3C6H10OH, derived from cresol by ...
methyldopa
/meth'euhl doh"peuh/, n. Pharm. a white powder, C10H13NO4, used in the treatment of hypertension. [1950-55; METHYL- + DOPA] * * *
methylene
/meth"euh leen'/, adj. Chem. containing the methylene group. [ < F méthylène (coined in 1834), equiv. to Gk méth(y) wine (see MEAD1) + hýl(e) wood + F -ène -ENE, taken to ...
methylene blue
Chem., Pharm. a dark-green, crystalline compound, C16H18ClN3S, that dissolves in water to form a deep-blue solution: used chiefly as a dye, as a bacteriological and biological ...
methylene chloride
Chem. a colorless, volatile liquid, CH2Cl2, used chiefly as a solvent, as a refrigerant, and as a local anesthetic in dentistry. Also called methylene dichloride, ...
methylene dioxyamphetamine
/duy ok"see am fet"euh meen', -min, -ok'see-/ Pharm. See MDA. [DI-1 + OXY- + AMPHETAMINE] * * *
methylene group
Chem. the bivalent organic group >CH2, derived from methane. Also called methylene radical. * * *
methylene iodide
Chem. a yellow liquid, CH2I2, soluble in alcohol and ether: used for the separation of mixtures of minerals and in organic synthesis. Also called diiodomethane. * * *
methyleneblue
methylene blue n. A basic aniline dye, C16H18N3SCl·3H2O, that forms a deep blue solution when dissolved in water. It is used as an antidote for cyanide poisoning and a ...
methylethyl ketone
methyl ethyl ketone n. See butanone. * * *
methylglyoxal
/meth'euhl gluy ok"sal, -seuhl/, n. Chem. See pyruvic aldehyde. [1895-1900; METHYL- + glyoxal, equiv. to GLY(COL) + OXAL(IC ACID)] * * *
methylheptenone
/meth'euhl hep"teuh nohn'/, n. Chem. a colorless liquid, C8H14O, occurring in many essential oils and produced by synthesis: used in organic synthesis and in the manufacture of ...
methylic
/me thil"ik/, adj. of, pertaining to, or characteristic of the methyl group. [1825-35; METHYL- + -IC] * * *
methylidyne group
/me thil"i duyn'/, Chem. the trivalent group _=CH. Also called methylidyne radical. [METHYL + -IDE + -INE2] * * *
methylisobutenyl ketone
/meth"euhl uy'soh byooht"n il, meth'-/, Chem. See mesityl oxide. [METHYL- + ISO- + BUTENE + -YL] * * *
methylisocyanate
methyl isocyanate n. A crystalline compound, C2H3NS, used as a pesticide. * * *
methylmercury
/meth'euhl merr"kyeuh ree/, n. Chem. any of several extremely toxic organometallic compounds, Hg(CH3)2, formed from metallic mercury by the action of microorganisms and capable ...
methylmethacrylate
methyl methacrylate n. A colorless liquid, CH2C(CH3)COOCH3, used as a monomer in plastics. * * *
methylnaphthalene
/meth'euhl naf"theuh leen', -nap"-/, n. Chem. a compound, C11H10, whose alpha isomer, a colorless liquid, is used in determining cetane numbers. [1880-85; METHYL- + ...
methylparaben
/meth'euhl par"euh ben'/, n. Chem. a fine, white, needlelike substance, C8H8O3, used chiefly as a preservative in foods and pharmaceuticals. [METHYL- + PARA- + BEN(ZOIC ACID)] * ...
methylphenidate
/meth'euhl fen"i dayt', -fee"ni-/, n. Pharm. a central nervous system stimulant, C14H19NO2, used in the control of hyperkinetic syndromes and narcolepsy. [1955-60; METHYL + PHEN- ...
methylphenylcarbinyl acetate
/meth"euhl fen'l kahr"beuh nil, -feen'l-, meth'-/, Chem. a colorless, synthetic liquid, C10H12O2, having a strong floral odor and occurring in oil of gardenia: used chiefly in ...
methylprednisolone
meth·yl·pred·nis·o·lone (mĕth'əl-prĕd-nĭsʹə-lōn') n. A glucocorticoid used therapeutically primarily as an anti-inflammatory agent. * * *
methylrosaniline chloride
/meth"euhl roh zan"euh lin, -luyn', meth'-/. See gentian violet. [METHYL- + ROSANILINE] * * *
methyltestosterone
/meth'euhl te stos"teuh rohn'/, n. Pharm. a synthetic androgenic steroid drug, C20H30O2, used for its anabolic properties in males in the treatment of hypogonadism and other ...
methyltheobromine
/meth"euhl thee'euh broh"meen, -min, meth'-/, n. Chem. caffeine. [METHYL- + THEOBROMINE] * * *
methylthionine chloride
/meth'euhl thuy"euh neen', -nin/, Chem. See methylene blue. [METHYL- + THIONINE] * * *
methyltrinitrobenzene
/meth"euhl truy nuy'troh ben"zeen, -ben zeen"/, n. Chem. See TNT. [METHYL- + TRI- + NITRO- + BENZENE] * * *
methysergide
/meth'euh serr"juyd/, n. Pharm. an ergot alkaloid derivative, C21H27N3O2, used in the prophylaxis and treatment of migraine and cluster headaches. [1960-65; METH- + (l)yserg(ic) ...
metic
/met"ik/, n. an alien resident of an ancient Greek city who paid a tax for the right to live there. [1800-10; < LL metycus, var. of metoecus < Gk métoikos emigrant, equiv. to ...
metical
/met"i kal'/; Port. /me ti kahl"/, n., pl. meticals, Port. meticais /-kuysh"/. a brass coin and monetary unit of Mozambique, equal to 100 centavos: replaced the escudo in 1980. * ...
meticulosity
See meticulous. * * *
meticulous
—meticulously, adv. —meticulousness, meticulosity /meuh tik'yeuh los"i tee/, n. /meuh tik"yeuh leuhs/, adj. 1. taking or showing extreme care about minute details; precise; ...
meticulously
See meticulosity. * * *
meticulousness
See meticulosity. * * *
métier
/may"tyay, may tyay"/, n. 1. a field of work; occupation, trade, or profession. 2. a field of work or other activity in which one has special ability or training; ...
métis
/may tees", -tee"/, n., pl. métis /-tees", -teez"/. 1. any person of mixed ancestry. 2. (cap.) Canadian. the offspring of an American Indian and a white person, esp. one of ...
Metis
/mee"tis/, n. Class. Myth. a Titaness, the daughter of Oceanus and Tethys and the mother of Athena by Zeus. Zeus swallowed Metis, and Athena was born from his head. * * * In ...
métisse
/may tees"/, n., pl. métisses /-tees", -tee"siz/. 1. a woman of mixed ancestry. 2. (cap.) Canadian. a woman of white, esp. French, and American Indian parentage. Also, ...
Metlitzki, Dorothee
▪ 2002       American literary scholar, educator, and Jewish activist (b. July 27, 1914, Königsberg, East Prussia [now Kaliningrad, Russia]—d. April 14, 2001, Hamden, ...
Metochites, Theodore
▪ Byzantine statesman born c. 1270, Nicaea, Nicaean empire [now İznik, Turkey] died March 13, 1332, Constantinople, Byzantine Empire [now Istanbul, ...
metoclopramide
/met'oh kloh"preuh muyd'/, n. Pharm. a white crystalline substance, C14H22ClN3O2, used primarily in the symptomatic treatment of certain upper gastrointestinal tract problems, ...
metoestrus
/met es"treuhs, -ee"streuhs/, n. metestrus. * * *
Metol
/mee"tawl, -tol/, Chem., Trademark. a brand name for a colorless, water-soluble salt, C14H20N2O6S, used chiefly as a photographic developer. * * *
metolazone
/me toh"leuh zohn'/, n. Pharm. a thiazide diuretic, C16H16ClN3O3S, used in the treatment of hypertension and as a diuretic in patients with chronic renal failure. [contr. and ...
Metonic cycle
/mi ton"ik/, Astron. a cycle of 235 synodic months, very nearly equal to 19 years, after which the new moon occurs on the same day of the year as at the beginning of the cycle ...
Metoniccycle
Me·ton·ic cycle (mĭ-tŏnʹĭk) n. A period of 235 lunar months, or about 19 years in the Julian calendar, at the end of which the phases of the moon recur in the same order ...
metonym
/met"euh nim/, n. a word used in metonymy. [1830-40; back formation from METONYMY] * * *
metonymic
See metonymy. * * *
metonymical
—metonymically, adv. /met'euh nim"i keuhl/, adj. having the nature of metonymy. Also, metonymic. [1570-80; < Gk metonymik(ós) (see METONYMY, -IC) + -AL1] * * *
metonymically
See metonymic. * * *
metonymy
/mi ton"euh mee/, n. Rhet. a figure of speech that consists of the use of the name of one object or concept for that of another to which it is related, or of which it is a part, ...
metoo
me·too or me-too (mēʹto͞oʹ) adj. Informal Using principles, practices, or designs copied from and closely similar to those of a rival: “Ready availability of inexpensive ...
metope
/met"euh pee', -ohp/, n. Archit. any of the square spaces, either decorated or plain, between triglyphs in the Doric frieze. Also called intertriglyph. See diag. under ...
metopic
/mi top"ik/, adj. Anat. of or pertaining to the forehead; frontal. [1875-80; < Gk métop(on) forehead + -IC] * * *
metopon
met·o·pon (mĕtʹə-pŏn') n. A narcotic drug, C18H21NO3, derived from morphine and used in the form of its hydrochloride as an ...
metopon hydrochloride
metopon hydrochloride [met′ə pän΄] n. 〚< met(hyldihydr)o(mor)p(hin)on(e)〛 a narcotic drug, C18H21O3N·HCl, derived from morphine, but slightly more potent: used in ...
metoprolol
/met'oh proh"lawl, -lol/, n. Pharm. a beta blocker, C15H25NO3, used in the treatment of hypertension, angina, and cardiac arrhythmias. [contr. of the chemical name] * * *
metr-
var. of metro-2 before a vowel: metralgia. * * *
metralgia
/mi tral"jee euh/, n. Pathol. pain in the uterus. [1895-1900; METR- + ALGIA] * * *
Métraux, Alfred
▪ Swiss anthropologist born Nov. 5, 1902, Lausanne, Switz. died April 12, 1963, Paris, Fr.       Swiss anthropologist noted for his pioneering contributions to South ...
Metrazol
/me"treuh zawl', -zol'/, Pharm., Trademark. a brand of pentylenetetrazol. * * *
metre
/mee"teuhr/, n., v., metred, metring. Brit. meter. * * * I Basic unit of length in the metric system and the International System of Units. In 1983 the General Conference on ...
metrētēs
▪ unit of measurement       primary liquid measure of the ancient Greeks, equivalent to 39.4 litres, or about 9 gallons. In the Greek system, of which the smallest ...
metric
metric1 /me"trik/, adj. pertaining to the meter or to the metric system. [1860-65; < F métrique, deriv. of mètre METER1; see -IC] metric2 /me"trik/, adj. 1. pertaining to ...
metric centner
centner (def. 2). * * *
metric hundredweight
a unit of weight equivalent to 50 kilograms. * * *
metric mile
metric mile n. Track & Field a measure of distance equal to 1,500 meters * * *
metric space
Math. a space with a metric defined on it. [1925-30] * * * In mathematics, a set of objects equipped with a concept of distance. The objects can be thought of as points in ...
metric system
a decimal system of weights and measures, adopted first in France but now widespread, universally used in science, mandatory for use for all purposes in a large number of ...
metric ton
a unit of 1000 kilograms, equivalent to 2204.62 avoirdupois pounds. Also called tonne. [1920-25] * * *
metric topology
Math. a topology for a space in which open sets are defined in terms of a given metric. * * *
metrical
—metrically, adv. —metricism /me"treuh siz'euhm/, metricity /me tris"i tee, mi-/, n. /me"tri keuhl/, adj. 1. pertaining to meter or poetic measure. 2. composed in meter or ...
metrical mile
(in track and swimming) a race of 1500 meters, nearly equivalent to a mile. * * *
metrically
See metrical. * * *
metricate
metricate [me′tri kāt΄] vt. metricated, metricating to change over to the metric system of weights and measures metrication n. * * *
metrication
/me'tri kay"sheuhn/, n. the act, process, or result of establishing the metric system as the standard system of measurement. Also called metrification. [1960-65; METRIC1 + ...
metrician
/mi trish"euhn/, n. a metrist. [1375-1425; late ME metricion. See METRIC2, -IAN] * * *
metricize
/me"treuh suyz'/, v.t., metricized, metricizing. 1. to express in terms of the metric system. 2. Math. metrize. Also, esp. Brit., metricise. [1870-75; METRIC1 + -IZE] * * *
metricmile
metric mile n. The 1,500-meter run in track and field. * * *
metrics
/me"triks/, n. (used with a sing. v.) 1. the science of meter. 2. the art of metrical composition. [1895-1900; see METRIC2, -ICS] * * *
metricsystem
metric system n. A decimal system of units based on the meter as a unit length, the kilogram as a unit mass, and the second as a unit time. See table at measurement. * * *


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