| 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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| microelectronics | (noun) the branch of electronics that deals with miniature components | - |
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| micrometre | (noun) a metric unit of length equal to one millionth of a meter | Synonyms: micrometer, micron |
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| micrometry | (noun) measuring with a micrometer | - |
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| micromillimetre | (noun) a metric unit of length equal to one billionth of a meter | Synonyms: micromillimeter, millimicron, nanometer, nanometre, nm |
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| micronutrient | (noun) a substance needed only in small amounts for normal body function (e.g., vitamins or minerals) | - |
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| midstream | (noun) the middle of a stream | - |
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| millilitre | (noun) a metric unit of volume equal to one thousandth of a liter | Synonyms: cc, cubic centimeter, cubic centimetre, mil, milliliter, ml |
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| millimetre | (noun) a metric unit of length equal to one thousandth of a meter | Synonyms: millimeter, mm |
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| minestrone | (noun) soup made with a variety of vegetables | Synonyms: petite marmite, vegetable soup |
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| ministrant | (noun) someone who serves as a minister | - |
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| ministration | (noun) assistance in time of difficulty | Synonyms: relief, succor, succour |
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| ministry | (noun) the work of a minister of religion | - |
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| (noun) building where the business of a government ministry is transacted | - |
| (noun) a government department under the direction of a minister of state | - |
| (noun) religious ministers collectively (especially Presbyterian) | - |
| minstrel | (noun) a singer of folk songs | Synonyms: folk singer, jongleur, poet-singer, troubadour |
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| (noun) a performer in a minstrel show | - |
| minstrelsy | (noun) the art of a minstrel | - |
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| (noun) ballads sung by minstrels | - |
| (noun) a troupe of minstrels | - |
| misconstrual | (noun) a kind of misinterpretation resulting from putting a wrong construction on words or actions (often deliberately) | Synonyms: misconstruction |
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| misconstruction | (noun) an ungrammatical constituent | - |
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| (noun) a kind of misinterpretation resulting from putting a wrong construction on words or actions (often deliberately) | Synonyms: misconstrual |
| mistral | (noun) a strong north wind that blows in France during the winter | - |
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| mistranslation | (noun) an incorrect translation | - |
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| mistreatment | (noun) the practice of treating (someone or something) badly | - |
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| mistress | (noun) a woman master who directs the work of others | - |
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| (noun) an adulterous woman; a woman who has an ongoing extramarital sexual relationship with a man | Synonyms: fancy woman, kept woman |
| (noun) a woman schoolteacher (especially one regarded as strict) | Synonyms: schoolma'am, schoolmarm, schoolmistress |
| mistrial | (noun) a trial that is invalid or inconclusive | - |
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| mistrust | (noun) the trait of not trusting others | Synonyms: distrust, distrustfulness |
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| (noun) doubt about someone's honesty | Synonyms: distrust, misgiving, suspicion |
| mitre | (noun) a liturgical headdress worn by bishops on formal occasions | Synonyms: miter |
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| (noun) the surface of a beveled end of a piece where a miter joint is made | Synonyms: miter |
| (noun) joint that forms a corner; usually both sides are bevelled at a 45-degree angle to form a 90-degree corner | Synonyms: miter, miter joint, mitre joint |
| mitrewort | (noun) any of various rhizomatous perennial herbs of the genus Mitella having a capsule resembling a bishop's miter | Synonyms: bishop's cap, miterwort |
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| monitrice | (noun) an assistant (often the father of the soon-to-be-born child) who provides support for a woman in labor by encouraging her to use techniques learned in childbirth-preparation classes | Synonyms: birthing coach, doula, labor coach |
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| monocentrism | (noun) the property of having or proceeding from a single center. | - |
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| monolatry | (noun) the worship of a single god but without claiming that it is the only god | - |
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| monotreme | (noun) the most primitive mammals comprising the only extant members of the subclass Prototheria | Synonyms: egg-laying mammal |
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| monstrance | (noun) (Roman Catholic Church) a vessel (usually of gold or silver) in which the consecrated Host is exposed for adoration | Synonyms: ostensorium |
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| (noun) proof by a process of argument or a series of proposition proving an asserted conclusion | Synonyms: demonstration |
| monstrosity | (noun) something hideous or frightful | - |
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| (noun) a person or animal that is markedly unusual or deformed | Synonyms: freak, lusus naturae, monster |
| motortruck | (noun) an automotive vehicle suitable for hauling | Synonyms: truck |
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| mousetrap | (noun) (American football) a play in which a defensive player is allowed to cross the line of scrimmage and then blocked off as the runner goes through the place the lineman vacated | Synonyms: trap play |
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| (noun) a trap for catching mice | - |
| musketry | (noun) the technique of using small arms (especially in battle) | - |
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| (noun) musketeers and their muskets collectively | - |
| myometritis | (noun) inflammation of the myometrium | - |
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| myometrium | (noun) the smooth muscle forming the wall of the uterus | - |
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| myriametre | (noun) a metric unit of length equal to 10,000 meters | Synonyms: mym, myriameter |
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| naltrexone | (noun) an oral antagonist against the action of opiates | - |
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| nanometre | (noun) a metric unit of length equal to one billionth of a meter | Synonyms: micromillimeter, micromillimetre, millimicron, nanometer, nm |
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| narcotraffic | (noun) traffic in illegal drugs | Synonyms: drug traffic, drug trafficking |
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| natriuresis | (noun) the presence of abnormally large amounts of sodium in the urine | - |
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| natrolite | (noun) a group of minerals of the zeolite family consisting of a hydrous silicate of sodium and aluminum | - |
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| necrolatry | (noun) superstitious worship or veneration of the dead. | - |
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| negatron | (noun) an elementary particle with negative charge | Synonyms: electron |
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| negotiatress | (noun) a woman negotiator | Synonyms: negotiatrix |
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| negotiatrix | (noun) a woman negotiator | Synonyms: negotiatress |
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| neuropsychiatry | (noun) the branch of medicine dealing with mental disorders attributable to diseases of the nervous system | - |
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| neurotransmitter | (noun) a neurochemical that transmits nerve impulses across a synapse | - |
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| neurotropism | (noun) an affinity for neural tissues | - |
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| neutral | (noun) one who does not side with any party in a war or dispute | - |
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| neutralisation | (noun) action intended to nullify the effects of some previous action | Synonyms: counteraction, neutralization |
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| (noun) action intended to keep a country politically neutral or exclude it from a possible war | Synonyms: neutralization |
| (noun) (euphemism) the removal of a threat by killing or destroying it (especially in a covert operation or military operation) | Synonyms: neutralization |
| (noun) a chemical reaction in which an acid and a base interact with the formation of a salt; with strong acids and bases the essential reaction is the combination of hydrogen ions with hydroxyl ions to form water | Synonyms: neutralisation reaction, neutralization, neutralization reaction |
| neutralism | (noun) a policy of neutrality or nonalignment in international affairs | - |
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| neutralist | (noun) an advocate of neutrality in international affairs | - |
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| neutrality | (noun) nonparticipation in a dispute or war | - |
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| (noun) pH value of 7 | - |
| (noun) tolerance attributable to a lack of involvement | Synonyms: disinterest |
| neutralization | (noun) action intended to nullify the effects of some previous action | Synonyms: counteraction, neutralisation |
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| (noun) action intended to keep a country politically neutral or exclude it from a possible war | Synonyms: neutralisation |
| (noun) (euphemism) the removal of a threat by killing or destroying it (especially in a covert operation or military operation) | Synonyms: neutralisation |
| (noun) a chemical reaction in which an acid and a base interact with the formation of a salt; with strong acids and bases the essential reaction is the combination of hydrogen ions with hydroxyl ions to form water | Synonyms: neutralisation, neutralisation reaction, neutralization reaction |
| neutrino | (noun) an elementary, electrically neutral particle with a very small mass | - |
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| neutron | (noun) an elementary particle with 0 charge and mass about equal to a proton; enters into the structure of the atomic nucleus | - |
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| neutropenia | (noun) leukopenia in which the decrease is primarily in number of neutrophils (the chief phagocytic leukocyte) | - |
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| neutrophil | (noun) the chief phagocytic leukocyte; stains with either basic or acid dyes | Synonyms: neutrophile |
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| neutrophile | (noun) the chief phagocytic leukocyte; stains with either basic or acid dyes | Synonyms: neutrophil |
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| ngultrum | (noun) the basic unit of money in Bhutan | - |
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| nightrider | (noun) member of a secret mounted band in United States South after the American Civil War; committed acts of intimidation and revenge | Synonyms: night rider |
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| nitramine | (noun) a yellow crystalline explosive solid that is used in detonators | Synonyms: tetryl |
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| nitrate | (noun) any compound containing the nitrate group (such as a salt or ester of nitric acid) | - |
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| nitrazepam | (noun) a hypnotic and sedative drug of the benzodiazepine type | - |
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| nitre | (noun) (KNO3) used especially as a fertilizer and explosive | Synonyms: niter, potassium nitrate, saltpeter, saltpetre |
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| nitride | (noun) a compound containing nitrogen and a more electropositive element (such as phosphorus or a metal) | - |
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| nitrification | (noun) the oxidation of ammonium compounds in dead organic material into nitrates and nitrites by soil bacteria (making nitrogen available to plants) | - |
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| (noun) the chemical process in which a nitro group is added to an organic compound (or substituted for another group in an organic compound) | - |
| nitril | (noun) any of a class of organic compounds containing the cyano radical -CN | Synonyms: cyanide, nitrile |
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| nitrile | (noun) any of a class of organic compounds containing the cyano radical -CN | Synonyms: cyanide, nitril |
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| nitrite | (noun) the radical -NO2 or any compound containing it (such as a salt or ester of nitrous acid) | - |
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| nitrobacteria | (noun) soil bacteria that convert nitrites to nitrates | Synonyms: nitric bacteria |
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| nitrobacterium | (noun) any of the bacteria in the soil that take part in the nitrogen cycle; they oxidize ammonium compounds into nitrites or oxidize nitrites into nitrates | - |
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| nitrobenzene | (noun) a poisonous oily water-soluble liquid used as a solvent and in the manufacture of aniline | - |
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| nitrocalcite | (noun) the mineral form of calcium nitrate | - |
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| nitrocellulose | (noun) a nitric acid ester; used in lacquers and explosives | Synonyms: cellulose nitrate, guncotton, nitrocotton |
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| nitrochloroform | (noun) a heavy colorless insoluble liquid compound that causes tears and vomiting; used as a pesticide and as tear gas | Synonyms: chloropicrin |
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| nitrochloromethane | (noun) gaseous form of chloropicrin used as tear gas | - |
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| nitrocotton | (noun) a nitric acid ester; used in lacquers and explosives | Synonyms: cellulose nitrate, guncotton, nitrocellulose |
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| nitrofuran | (noun) derivative of furan used to inhibit bacterial growth | - |
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| nitrofurantoin | (noun) derivative of nitrofuran used as an antibacterial medicine (trade name Macrodantin) effective against a broad range of Gram-positive and Gram-negative bacteria; used to treat infections of the urinary tract | Synonyms: Macrodantin |
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| nitrogen | (noun) a common nonmetallic element that is normally a colorless odorless tasteless inert diatomic gas; constitutes 78 percent of the atmosphere by volume; a constituent of all living tissues | Synonyms: atomic number 7, N |
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| nitrogenase | (noun) an enzyme of nitrogen-fixing microorganisms that catalyzes the conversion of nitrogen to ammonia | - |
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| nitroglycerin | (noun) a heavy yellow poisonous oily explosive liquid obtained by nitrating glycerol; used in making explosives and medically as a vasodilator (trade names Nitrospan and Nitrostat) | Synonyms: glyceryl trinitrate, nitroglycerine, Nitrospan, Nitrostat, trinitroglycerin |
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| nitroglycerine | (noun) a heavy yellow poisonous oily explosive liquid obtained by nitrating glycerol; used in making explosives and medically as a vasodilator (trade names Nitrospan and Nitrostat) | Synonyms: glyceryl trinitrate, nitroglycerin, Nitrospan, Nitrostat, trinitroglycerin |
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| nitrosobacteria | (noun) soil bacteria that oxidize ammonia to nitrites | Synonyms: nitrous bacteria |
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| nontricyclic | (noun) a class of antidepressant drugs that are not tricyclic drugs and do not act by inhibiting MAO | Synonyms: nontricyclic antidepressant, nontricyclic antidepressant drug, nontricyclic drug |
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| norgestrel | (noun) synthetic progestin used in oral contraceptives | - |
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