| metencephalon | (noun) the part of the hindbrain that develops into the pons and the cerebellum | - |
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| meteor | (noun) (astronomy) any of the small solid extraterrestrial bodies that hits the earth's atmosphere | Synonyms: meteoroid |
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| (noun) a streak of light in the sky at night that results when a meteoroid hits the earth's atmosphere and air friction causes the meteoroid to melt or vaporize or explode | Synonyms: shooting star |
| meteorite | (noun) stony or metallic object that is the remains of a meteoroid that has reached the earth's surface | - |
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| meteoroid | (noun) (astronomy) any of the small solid extraterrestrial bodies that hits the earth's atmosphere | Synonyms: meteor |
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| meteorologist | (noun) a specialist who studies processes in the earth's atmosphere that cause weather conditions | - |
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| meteorology | (noun) the earth science dealing with phenomena of the atmosphere (especially weather) | - |
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| (noun) predicting what the weather will be | Synonyms: weather forecasting |
| meteortropism | (noun) an effect of climate on biological processes (as the effect on joint pains etc.) | - |
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| meter | (noun) any of various measuring instruments for measuring a quantity | - |
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| (noun) rhythm as given by division into parts of equal duration | Synonyms: metre, time |
| (noun) (prosody) the accent in a metrical foot of verse | Synonyms: beat, cadence, measure, metre |
| (noun) the basic unit of length adopted under the Systeme International d'Unites (approximately 1.094 yards) | Synonyms: m, metre |
| meterstick | (noun) a rule one meter long (usually marked off in centimeters and millimeters) | Synonyms: metrestick |
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| metformin | (noun) an antidiabetic drug (trade name Glucophage) prescribed to treat type II diabetes | Synonyms: Glucophage |
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| meth | (noun) an amphetamine derivative (trade name Methedrine) used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant | Synonyms: chalk, chicken feed, crank, deoxyephedrine, glass, ice, methamphetamine, methamphetamine hydrochloride, Methedrine, shabu, trash |
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| methacholine | (noun) parasympathomimetic drug (trademark Mecholyl) that stimulates secretions and smooth muscle activity | Synonyms: Mecholyl |
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| methadon | (noun) synthetic narcotic drug similar to morphine but less habit-forming; used in narcotic detoxification and maintenance of heroin addiction | Synonyms: dolophine hydrochloride, fixer, methadone, methadone hydrochloride, synthetic heroin |
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| methadone | (noun) synthetic narcotic drug similar to morphine but less habit-forming; used in narcotic detoxification and maintenance of heroin addiction | Synonyms: dolophine hydrochloride, fixer, methadon, methadone hydrochloride, synthetic heroin |
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| methamphetamine | (noun) an amphetamine derivative (trade name Methedrine) used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant | Synonyms: chalk, chicken feed, crank, deoxyephedrine, glass, ice, meth, methamphetamine hydrochloride, Methedrine, shabu, trash |
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| methanal | (noun) a colorless poisonous gas; made by the oxidation of methanol | Synonyms: formaldehyde |
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| methane | (noun) a colorless odorless gas used as a fuel | - |
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| methanogen | (noun) archaebacteria found in anaerobic environments such as animal intestinal tracts or sediments or sewage and capable of producing methane; a source of natural gas | - |
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| methanol | (noun) a light volatile flammable poisonous liquid alcohol; used as an antifreeze and solvent and fuel and as a denaturant for ethyl alcohol | Synonyms: methyl alcohol, wood alcohol, wood spirit |
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| methapyrilene | (noun) antihistamine used to treat allergic responses (as rhinitis or dermatitis or pruritus) | - |
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| methaqualone | (noun) sedative-hypnotic drug (trade name Quaalude) that is a drug of abuse | Synonyms: Quaalude |
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| metharbital | (noun) anticonvulsant drug (trade name Gemonil) used in the treatment of epilepsy | Synonyms: Gemonil |
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| metheglin | (noun) spiced or medicated mead | - |
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| methenamine | (noun) antibacterial agent (trade names Mandelamine and Urex) that is contained in many products that are used to treat urinary infections | Synonyms: Mandelamine, Urex |
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| methicillin | (noun) antibiotic drug of the penicillin family used in the treatment of certain staphylococcal infections | - |
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| methionine | (noun) a crystalline amino acid containing sulfur; found in most proteins and essential for nutrition | - |
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| methocarbamol | (noun) muscle relaxant for skeletal muscles (trade name Robaxin) used to treat spasms | Synonyms: Robaxin |
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| method | (noun) an acting technique introduced by Stanislavsky in which the actor recalls emotions or reactions from his or her own life and uses them to identify with the character being portrayed | Synonyms: method acting |
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| (noun) a way of doing something, especially a systematic way; implies an orderly logical arrangement (usually in steps) | - |
| methodicalness | (noun) the quality of appreciating method and system | Synonyms: orderliness |
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| methodology | (noun) the system of methods followed in a particular discipline | - |
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| (noun) the branch of philosophy that analyzes the principles and procedures of inquiry in a particular discipline | Synonyms: methodological analysis |
| methotrexate | (noun) toxic antimetabolite that limits cellular reproduction by acting as an antagonist to folic acid; used to treat certain cancers and psoriasis and rheumatoid arthritis | Synonyms: amethopterin, methotrexate sodium |
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| methyl | (noun) the univalent radical CH3- derived from methane | Synonyms: methyl group, methyl radical |
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| methylbenzene | (noun) a colorless flammable liquid obtained from petroleum or coal tar; used as a solvent for gums and lacquers and in high-octane fuels | Synonyms: toluene |
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| methyldopa | (noun) antihypertensive drug (trade name Aldomet) used in the treatment of high blood pressure | Synonyms: Aldomet, alpha methyl dopa |
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| methylene | (noun) the bivalent radical CH2 derived from methane | Synonyms: methylene group, methylene radical |
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| methylenedioxymethamphetamine | (noun) a stimulant drug that is chemically related to mescaline and amphetamine and is used illicitly for its euphoric and hallucinogenic effects; it was formerly used in psychotherapy but in 1985 it was declared illegal in the United States | Synonyms: MDMA |
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| methylphenidate | (noun) central nervous system stimulant (trade name Ritalin) used in the treatment of narcolepsy in adults and attention deficit disorder in children | Synonyms: Ritalin |
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| methyltestosterone | (noun) an androgenic compound contained in drugs that are used to treat testosterone deficiency and female breast cancer and to stimulate growth and weight gain | - |
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| metic | (noun) an alien who paid a fee to reside in an ancient Greek city | - |
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| metical | (noun) the basic unit of money in Mozambique; equal to 100 centavos | - |
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| meticulosity | (noun) strict attention to minute details | Synonyms: meticulousness, punctiliousness, scrupulousness |
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| meticulousness | (noun) strict attention to minute details | Synonyms: meticulosity, punctiliousness, scrupulousness |
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| metier | (noun) an occupation for which you are especially well suited | Synonyms: medium |
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| (noun) an asset of special worth or utility | Synonyms: forte, long suit, speciality, specialty, strength, strong point, strong suit |
| metonym | (noun) a word that denotes one thing but refers to a related thing | - |
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| metonymy | (noun) substituting the name of an attribute or feature for the name of the thing itself (as in `they counted heads') | - |
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| metopion | (noun) the craniometric point midway between the frontal eminences of the skull | - |
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| metoprolol | (noun) beta blocker (trade name Lopressor) used in treating hypertension and angina and arrhythmia and acute myocardial infarction; has adverse side effects (depression and exacerbation of congestive heart failure etc.) | Synonyms: Lopressor |
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| metralgia | (noun) pain in the uterus | - |
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| metre | (noun) rhythm as given by division into parts of equal duration | Synonyms: meter, time |
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| (noun) (prosody) the accent in a metrical foot of verse | Synonyms: beat, cadence, measure, meter |
| (noun) the basic unit of length adopted under the Systeme International d'Unites (approximately 1.094 yards) | Synonyms: m, meter |
| metrestick | (noun) a rule one meter long (usually marked off in centimeters and millimeters) | Synonyms: meterstick |
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| metric | (noun) a system of related measures that facilitates the quantification of some particular characteristic | Synonyms: system of measurement |
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| (noun) a decimal unit of measurement of the metric system (based on meters and kilograms and seconds) | Synonyms: metric unit |
| (noun) a function of a topological space that gives, for any two points in the space, a value equal to the distance between them | Synonyms: metric function |
| metrication | (noun) the act of changing from imperial units of measurement to metric units: meters, grams, seconds | Synonyms: metrification |
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| metrics | (noun) the study of poetic meter and the art of versification | Synonyms: prosody |
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| metrification | (noun) the act of changing from imperial units of measurement to metric units: meters, grams, seconds | Synonyms: metrication |
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| (noun) writing a metrical composition (or the metrical structure of a composition) | - |
| metritis | (noun) inflammation of the lining of the uterus (of the endometrium) | Synonyms: endometritis |
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| metro | (noun) an electric railway operating below the surface of the ground (usually in a city) | Synonyms: subway, subway system, tube, underground |
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| metrology | (noun) the scientific study of measurement | - |
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| metronidazole | (noun) antiprotozoal medication (trade name Flagyl) used to treat trichomoniasis and giardiasis | Synonyms: Flagyl |
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| metronome | (noun) clicking pendulum indicates the exact tempo of a piece of music | - |
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| metronymic | (noun) a name derived from the name of your mother or a maternal ancestor | Synonyms: matronymic |
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| metropolis | (noun) people living in a large densely populated municipality | Synonyms: city |
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| (noun) a large and densely populated urban area; may include several independent administrative districts | Synonyms: city, urban center |
| metropolitan | (noun) a person who lives in a metropolis | - |
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| (noun) in the Eastern Orthodox Church this title is given to a position between bishop and patriarch; equivalent to archbishop in western Christianity | - |
| metroptosis | (noun) prolapse of the uterus | Synonyms: descensus uteri |
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| metrorrhagia | (noun) bleeding from the uterus that is not due to menstruation; usually indicative of disease (as cervical cancer) | - |
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| mettle | (noun) the courage to carry on | Synonyms: heart, nerve, spunk |
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| mettlesomeness | (noun) courageous high-spiritedness | - |
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| mew | (noun) the common gull of Eurasia and northeastern North America | Synonyms: Larus canus, mew gull, sea mew |
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| (noun) the sound made by a cat (or any sound resembling this) | Synonyms: meow, miaou, miaow, miaul |
| mews | (noun) street lined with buildings that were originally private stables but have been remodeled as dwellings | - |
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| mexiletine | (noun) antiarrhythmic drug (trade name Mexitil) used to treat ventricular arrhythmias | Synonyms: Mexitil |
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| mezcal | (noun) a small spineless globe-shaped cactus; source of mescal buttons | Synonyms: Lophophora williamsii, mescal, peyote |
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| mezereon | (noun) small European deciduous shrub with fragrant lilac-colored flowers followed by red berries on highly toxic twigs | Synonyms: Daphne mezereum, February daphne |
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| mezereum | (noun) the dried bark of the shrub mezereon | - |
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| mezuza | (noun) religious texts from Deuteronomy inscribed on parchment and rolled up in a case that is attached to the doorframe of many Jewish households in accordance with Jewish law | Synonyms: mezuzah |
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| mezuzah | (noun) religious texts from Deuteronomy inscribed on parchment and rolled up in a case that is attached to the doorframe of many Jewish households in accordance with Jewish law | Synonyms: mezuza |
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| mezzanine | (noun) intermediate floor just above the ground floor | Synonyms: entresol, mezzanine floor |
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| (noun) first or lowest balcony | Synonyms: first balcony |
| mezzo | (noun) the female singing voice between contralto and soprano | Synonyms: mezzo-soprano |
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| (noun) a soprano with a voice between soprano and contralto | Synonyms: mezzo-soprano |
| mezzotint | (noun) print produced by an engraving that has been scraped to represent light or shade | - |
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