| marrowbone | (noun) a bone containing edible marrow; used especially in flavoring soup | - |
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| mascarpone | (noun) soft mild Italian cream cheese | - |
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| masculine | (adjective) associated with men and not with women | - |
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| (adjective) male (of grammatical gender) | - |
| (adjective) (music or poetry) ending on an accented beat or syllable | - |
| (noun) a gender that refers chiefly (but not exclusively) to males or to objects classified as male | - |
| mearstone | (noun) an old term for a landmark that consisted of a pile of stones surmounted by an upright slab | Synonyms: meerestone, merestone |
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| meclizine | (noun) an antihistamine (trade name Antivert) used to treat or prevent motion sickness | Synonyms: Antivert, meclizine hydrochloride |
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| medicine | (noun) the learned profession that is mastered by graduate training in a medical school and that is devoted to preventing or alleviating or curing diseases and injuries | Synonyms: practice of medicine |
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| (noun) punishment for one's actions | Synonyms: music |
| (noun) (medicine) something that treats or prevents or alleviates the symptoms of disease | Synonyms: medicament, medication, medicinal drug |
| (noun) the branches of medical science that deal with nonsurgical techniques | Synonyms: medical specialty |
| (verb) treat medicinally, treat with medicine | Synonyms: medicate |
| medroxyprogesterone | (noun) a progestin compound (trade name Provera) used to treat menstrual disorders | Synonyms: Provera |
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| meerestone | (noun) an old term for a landmark that consisted of a pile of stones surmounted by an upright slab | Synonyms: mearstone, merestone |
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| mefloquine | (noun) an antimalarial drug (trade name Lariam and Mephaquine) that is effective in cases that do not respond to chloroquine; said to produce harmful neuropsychiatric effects on some people | Synonyms: Lariam, mefloquine hydrochloride, Mephaquine |
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| megaphone | (noun) a cone-shaped acoustic device held to the mouth to intensify and direct the human voice | - |
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| melamine | (noun) a white crystalline organic base; used mainly in making melamine resins | Synonyms: cyanuramide |
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| membrane | (noun) a thin pliable sheet of material | - |
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| (noun) a pliable sheet of tissue that covers or lines or connects the organs or cells of animals or plants | Synonyms: tissue layer |
| membranophone | (noun) a musical percussion instrument; usually consists of a hollow cylinder with a membrane stretched across each end | Synonyms: drum, tympan |
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| menadione | (noun) a synthetic chemical compound that is a form of vitamin K, it is an analog of 1,4-naphthoquinone with a methyl group in the 2-position | Synonyms: vitamin K3 |
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| mepacrine | (noun) a drug (trade name Atabrine) used to treat certain worm infestations and once used to treat malaria | Synonyms: Atabrine, quinacrine, quinacrine hydrochloride |
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| meperidine | (noun) a synthetic narcotic drug (trade name Demerol) used to treat pain | Synonyms: Demerol, meperidine hydrochloride |
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| merbromine | (noun) a mercurial compound applied topically as an antiseptic; Mercurochrome is the trademark | Synonyms: Mercurochrome |
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| mercaptopurine | (noun) a drug (trade name Purinethol) that interferes with the metabolism of purine and is used to treat acute lymphocytic leukemia | Synonyms: Purinethol |
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| merestone | (noun) an old term for a landmark that consisted of a pile of stones surmounted by an upright slab | Synonyms: mearstone, meerestone |
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| mescaline | (noun) the hallucinatory alkaloid that is the active agent in mescal buttons | Synonyms: peyote |
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| methacholine | (noun) parasympathomimetic drug (trademark Mecholyl) that stimulates secretions and smooth muscle activity | Synonyms: Mecholyl |
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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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| methane | (noun) a colorless odorless gas used as a fuel | - |
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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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| 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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| methionine | (noun) a crystalline amino acid containing sulfur; found in most proteins and essential for nutrition | - |
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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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| 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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| 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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| mexiletine | (noun) antiarrhythmic drug (trade name Mexitil) used to treat ventricular arrhythmias | Synonyms: Mexitil |
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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 |
| microcrystalline | (adjective) containing crystals that are visible only under a microscope | - |
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| microphone | (noun) device for converting sound waves into electrical energy | Synonyms: mic, mike |
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| midline | (noun) the median plane of the body (or some part of the body) | Synonyms: midplane |
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| midplane | (noun) the median plane of the body (or some part of the body) | Synonyms: midline |
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| mifepristone | (noun) an abortion-inducing drug (trade name RU 486) developed in France; when taken during the first five weeks of pregnancy it blocks the action of progesterone so that the uterus sloughs off the embryo | Synonyms: abortion pill, RU 486 |
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| migraine | (noun) a severe recurring vascular headache; occurs more frequently in women than men | Synonyms: hemicrania, megrim, sick headache |
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| milestone | (noun) stone post at side of a road to show distances | Synonyms: milepost |
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| (noun) a significant event in your life (or in a project) | - |
| milline | (noun) an advertising measure; one agate line appearing in one million copies of a publication | - |
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| millstone | (noun) one of a pair of heavy flat disk-shaped stones that are rotated against one another to grind the grain | - |
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| (noun) any load that is difficult to carry | - |
| (noun) (figurative) something that hinders or handicaps | Synonyms: albatross |
| mine | (noun) explosive device that explodes on contact; designed to destroy vehicles or ships or to kill or maim personnel | - |
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| (noun) excavation in the earth from which ores and minerals are extracted | - |
| (verb) lay mines | - |
| (verb) get from the earth by excavation | - |
| minestrone | (noun) soup made with a variety of vegetables | Synonyms: petite marmite, vegetable soup |
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| minisubmarine | (noun) submersible vessel for one or two persons; for naval operations or underwater exploration | Synonyms: minisub |
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| minocycline | (noun) tetracycline antibiotic (trade name Minocin) used to treat a variety of bacterial and rickettsial infections | Synonyms: Minocin |
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| misfortune | (noun) unnecessary and unforeseen trouble resulting from an unfortunate event | Synonyms: bad luck |
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| (noun) an unfortunate state resulting from unfavorable outcomes | Synonyms: bad luck, ill luck, tough luck |
| moderne | (adjective) of or relating to a popularization of art deco that used bright colors and rectangular shapes | - |
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| molindone | (noun) antipsychotic drug (trade name Moban) used in the treatment of schizophrenia | Synonyms: Moban |
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| monoamine | (noun) a molecule containing one amine group (especially one that is a neurotransmitter) | - |
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| monocline | (noun) a geological formation in which all strata are inclined in the same direction | - |
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| monoplane | (noun) an airplane with a single wing | - |
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| monotone | (adjective) of a sequence or function; consistently increasing and never decreasing or consistently decreasing and never increasing in value | Synonyms: monotonic |
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| (adjective) sounded or spoken in a tone unvarying in pitch | Synonyms: flat, monotonic, monotonous |
| (noun) an unchanging intonation | Synonyms: drone, droning |
| (noun) a single tone repeated with different words or different rhythms (especially in rendering liturgical texts) | - |
| montane | (adjective) of or inhabiting mountainous regions | - |
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| moonshine | (noun) whiskey illegally distilled from a corn mash | Synonyms: bootleg, corn liquor |
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| (noun) the light of the Moon | Synonyms: Moon, moonlight |
| (verb) distill (alcohol) illegally; produce moonshine | - |
| moonstone | (noun) a transparent or translucent gemstone with a pearly luster; some specimens are orthoclase feldspar and others are plagioclase feldspar | - |
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| moraine | (noun) accumulated earth and stones deposited by a glacier | - |
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| morphine | (noun) an alkaloid narcotic drug extracted from opium; a powerful, habit-forming narcotic used to relieve pain | Synonyms: morphia |
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| mosstone | (adjective) of a moderate somewhat dull yellow-green color | Synonyms: moss green |
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| multilane | (adjective) (of roads and highways) having two or more lanes for traffic | - |
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| mundane | (adjective) belonging to this earth or world; not ideal or heavenly | Synonyms: terrene |
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| (adjective) found in the ordinary course of events | Synonyms: everyday, quotidian, routine, unremarkable, workaday |
| (adjective) concerned with the world or worldly matters | Synonyms: terrestrial |
| murine | (adjective) of or relating to or transmitted by a member of the family Muridae (rats and mice) | - |
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| (noun) a rodent that is a member of the family Muridae | - |
| muscadine | (noun) dull-purple grape of southern United States | Synonyms: bullace grape |
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| (noun) native grape of southeastern United States; origin of many cultivated varieties | Synonyms: Vitis rotundifolia |
| musteline | (noun) fissiped fur-bearing carnivorous mammals | Synonyms: mustelid, musteline mammal |
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| myeline | (noun) a white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers | Synonyms: medulla, myelin |
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| nabumetone | (noun) a nonsteroidal anti-inflammatory drug (trade name Relafen) | Synonyms: Relafen |
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| nalorphine | (noun) a narcotic antagonist (trade name Nalline) that counteracts the effects of narcotics (especially the effects of poisoning by morphine) | Synonyms: Nalline |
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| naloxone | (noun) a potent narcotic antagonist (trade name Narcan) especially effective with morphine | Synonyms: Narcan |
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| naltrexone | (noun) an oral antagonist against the action of opiates | - |
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| nandrolone | (noun) an androgen (trade names Durabolin or Kabolin) that is used to treat testosterone deficiency or breast cancer or osteoporosis | Synonyms: Durabolin, Kabolin |
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| nanomachine | (noun) a machine of the size of close to one nanometre | - |
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| naphazoline | (noun) vasoconstrictor (trade names Privine and Sudafed) used in nasal sprays to treat symptoms of nasal congestion and in eyedrops to treat eye irritation | Synonyms: Privine, Sudafed |
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| naphthalene | (noun) a white crystalline strong-smelling hydrocarbon made from coal tar or petroleum and used in organic synthesis and as a fumigant in mothballs | - |
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| naphthoquinone | (noun) a fat-soluble vitamin that helps in the clotting of blood | Synonyms: antihemorrhagic factor, vitamin K |
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| neckline | (noun) the line formed by the edge of a garment around the neck | - |
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| nectarine | (noun) a variety or mutation of the peach that has a smooth skin | - |
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| (noun) variety or mutation of the peach bearing fruit with smooth skin and (usually) yellow flesh | Synonyms: nectarine tree, Prunus persica nectarina |
| nefazodone | (noun) an antidepressant drug (trade name Serzone) | Synonyms: Serzone |
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| nemertine | (noun) soft unsegmented marine worms that have a threadlike proboscis and the ability to stretch and contract | Synonyms: nemertean, proboscis worm, ribbon worm |
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| neoprene | (noun) a synthetic rubber that is resistant to oils and aging; used in waterproof products | - |
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| neostigmine | (noun) a cholinergic drug (trade name Prostigmin) used to treat some ophthalmic conditions and to treat myasthenia gravis | Synonyms: Prostigmin |
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| nepheline | (noun) a whitish mineral consisting of sodium aluminum silicate or potassium aluminum silicate in crystalline form; used in the manufacture of ceramics and enamels | Synonyms: nephelite |
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| neuroendocrine | (adjective) of or relating to the nervous and endocrine systems (especially as they function together) | - |
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| neurohormone | (noun) a hormone that is released by nerve impulses (e.g., norepinephrine or vasopressin) | - |
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| nevirapine | (noun) a non-nucleoside reverse transcriptase inhibitor (trade name Viramune) used to treat AIDS and HIV | Synonyms: Viramune |
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| nicotine | (noun) an alkaloid poison that occurs in tobacco; used in medicine and as an insecticide | - |
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| nifedipine | (noun) calcium blocker (trade name Procardia); appears to increase the risk of recurrent heart attacks | Synonyms: Procardia |
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| nine | (adjective) denoting a quantity consisting of one more than eight and one less than ten | Synonyms: 9, ix |
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| (noun) one of four playing cards in a deck with nine pips on the face | Synonyms: nine-spot |
| (noun) a team of professional baseball players who play and travel together | Synonyms: ball club, baseball club, club |
| (noun) the cardinal number that is the sum of eight and one | Synonyms: 9, ennead, IX, Nina from Carolina, niner |
| nitramine | (noun) a yellow crystalline explosive solid that is used in detonators | Synonyms: tetryl |
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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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| nitrochloromethane | (noun) gaseous form of chloropicrin used as tear gas | - |
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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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| nocturne | (noun) a pensive lyrical piece of music (especially for the piano) | Synonyms: notturno |
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| noncrystalline | (adjective) not crystalline | - |
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| none | (adjective) not any; entity, negative pronoun | - |
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| (noun) a service in the Roman Catholic Church formerly read or chanted at 3 PM (the ninth hour counting from sunrise) but now somewhat earlier | - |
| (noun) a canonical hour that is the ninth hour of the day counting from sunrise | - |
| (adverb) not at all or in no way | - |
| nonimmune | (adjective) (often followed by `to') likely to be affected with | Synonyms: liable, nonresistant, unresistant |
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| nonpasserine | (adjective) relating to or characteristic of birds that are not perching birds | - |
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| noradrenaline | (noun) a catecholamine precursor of epinephrine that is secreted by the adrenal medulla and also released at synapses | Synonyms: norepinephrine |
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| norepinephrine | (noun) a catecholamine precursor of epinephrine that is secreted by the adrenal medulla and also released at synapses | Synonyms: noradrenaline |
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| norethandrolone | (noun) a synthetic progestational hormone (trade name Norlutin) used in oral contraceptives and to treat endometriosis | Synonyms: norethindrone, norethindrone acetate, Norlutin |
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