| 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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| netherworld | (noun) (religion) the world of the dead | Synonyms: Hades, Hell, infernal region, Scheol, underworld |
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| neuroethics | (noun) the study of ethical implications of treatments for neurological diseases | - |
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| ninetieth | (noun) position 90 in a countable series of things | - |
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| nitrochloromethane | (noun) gaseous form of chloropicrin used as tear gas | - |
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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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| norethindrone | (noun) a synthetic progestational hormone (trade name Norlutin) used in oral contraceptives and to treat endometriosis | Synonyms: norethandrolone, norethindrone acetate, Norlutin |
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| norethynodrel | (noun) a progesterone derivative used in oral contraceptives and in the control of menstruation and the treatment of abnormal uterine bleeding | - |
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| palaeoethnography | (noun) the ethnography of paleolithic humans | Synonyms: paleoethnography |
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| paleoethnography | (noun) the ethnography of paleolithic humans | Synonyms: palaeoethnography |
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| pentamethylenetetrazol | (noun) a drug used as a circulatory and respiratory stimulant; larger doses cause convulsions in shock therapy; Metrazol is a trademark | Synonyms: Metrazol, pentylenetetrazol |
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| perchloromethane | (noun) a colorless nonflammable liquid used as a solvent for fats and oils; because of its toxicity its use as a cleaning fluid or fire extinguisher has declined | Synonyms: carbon tet, carbon tetrachloride, tetrachloromethane |
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| phenylethylene | (noun) a colorless oily liquid; the monomer for polystyrene | Synonyms: cinnamene, styrene, vinylbenzene |
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| plethodont | (noun) mostly terrestrial salamanders that breathe through their thin moist skin; lay eggs in moist places on land; rarely enter water | Synonyms: lungless salamander |
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| plethora | (noun) extreme excess | Synonyms: embarrassment, overplus, superfluity |
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| plethysmograph | (noun) a measuring instrument for measuring changes in volume of a part or organ or whole body (usually resulting from fluctuations in the amount of blood it contains) | - |
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| polyethylene | (noun) a lightweight thermoplastic; used especially in packaging and insulation | Synonyms: polythene |
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| polytetrafluoroethylene | (noun) a material used to coat cooking utensils and in industrial applications where sticking is to be avoided | Synonyms: Teflon |
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| polyurethan | (noun) any of various polymers containing the urethane radical; a wide variety of synthetic forms are made and used as adhesives or plastics or paints or rubber | Synonyms: polyurethane |
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| polyurethane | (noun) any of various polymers containing the urethane radical; a wide variety of synthetic forms are made and used as adhesives or plastics or paints or rubber | Synonyms: polyurethan |
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| promethazine | (noun) antihistamine (trade name Phenergan) used to treat allergies; also an antiemetic used to treat motion sickness | Synonyms: Phenergan |
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| promethium | (noun) a soft silvery metallic element of the rare earth group having no stable isotope; was discovered in radioactive form as a fission product of uranium | Synonyms: atomic number 61, Pm |
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| pyrethrum | (noun) spring-flowering garden perennial of Asiatic origin having finely divided aromatic leaves and white to pink-purple flowers; source of an insecticide; sometimes placed in genus Chrysanthemum | Synonyms: Chrysanthemum coccineum, painted daisy, Tanacetum coccineum |
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| (noun) white-flowered pyrethrum of Balkan area whose pinnate leaves are white and silky-hairy below; source of an insecticide; sometimes placed in genus Chrysanthemum | Synonyms: Chrysanthemum cinerariifolium, Dalmatia pyrethrum, Dalmatian pyrethrum, Tanacetum cinerariifolium |
| (noun) made of dried flower heads of pyrethrum plants | - |
| rethink | (noun) thinking again about a choice previously made | Synonyms: afterthought, reconsideration, second thought |
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| seventieth | (noun) position 70 in a countable series of things | - |
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| shibboleth | (noun) a manner of speaking that is distinctive of a particular group of people | - |
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| (noun) a favorite saying of a group, organization or individual | Synonyms: catchword, motto, slogan |
| sixtieth | (noun) one part in sixty equal parts | Synonyms: one-sixtieth |
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| (noun) position 60 in a countable series of things | - |
| stethoscope | (noun) a medical instrument for listening to the sounds generated inside the body | - |
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| sulfamethazine | (noun) a sulfa drug used like sulfadiazine and also in veterinary medicine | Synonyms: sulfamezathine |
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| sulfamethoxazole | (noun) a sulfonamide (trade name Gantanol) used to treat infections (especially infections of the urinary tract) | Synonyms: Gantanol |
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| sweetheart | (noun) a person loved by another person | Synonyms: steady, sweetie, truelove |
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| (noun) a very attractive or seductive looking woman | Synonyms: beauty, dish, knockout, looker, lulu, mantrap, peach, ravisher, smasher, stunner |
| (noun) any well-liked individual | - |
| (noun) a beloved person; used as terms of endearment | Synonyms: baby, beloved, darling, dear, dearest, dearie, deary, honey, love, sweetie |
| teeth | (noun) the kind and number and arrangement of teeth (collectively) in a person or animal | Synonyms: dentition |
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| teething | (noun) the eruption through the gums of baby teeth | Synonyms: dentition, odontiasis |
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| telethermometer | (noun) a thermometer that registers the temperature at some distant point | - |
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| teth | (noun) the 9th letter of the Hebrew alphabet | - |
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| tether | (noun) restraint consisting of a rope (or light chain) used to restrain an animal | Synonyms: lead, leash |
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| tetherball | (noun) a game with two players who use rackets to strike a ball that is tethered to the top of a pole; the object is to wrap the string around the pole | - |
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| tetrachlorethylene | (noun) anthelmintic agent used against hookworm and other nematodes | Synonyms: carbon dichloride, ethylene tetrachloride, tetrachloroethylene |
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| tetrachloroethylene | (noun) anthelmintic agent used against hookworm and other nematodes | Synonyms: carbon dichloride, ethylene tetrachloride, tetrachlorethylene |
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| tetrachloromethane | (noun) a colorless nonflammable liquid used as a solvent for fats and oils; because of its toxicity its use as a cleaning fluid or fire extinguisher has declined | Synonyms: carbon tet, carbon tetrachloride, perchloromethane |
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| tetrafluoroethylene | (noun) a flammable gaseous fluorocarbon used in making plastics (polytetrafluoroethylene resins) | - |
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| tetramethyldiarsine | (noun) a poisonous oily liquid with a garlicky odor composed of 2 cacodyl groups; undergoes spontaneous combustion in dry air | Synonyms: cacodyl |
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| thirtieth | (noun) position 30 in a countable series of things | - |
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| togetherness | (noun) affectionate closeness | - |
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| tribromoethanol | (noun) an intravenous anesthetic | Synonyms: tribromoethyl alcohol |
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| tribromomethane | (noun) colorless liquid haloform CHBr3 | Synonyms: bromoform |
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| trichlormethiazide | (noun) diuretic drug (trade name Naqua) used to treat hypertension | Synonyms: Naqua |
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| trichloroethane | (noun) a heavy colorless highly toxic liquid used as a solvent to clean electronic components and for dry cleaning and as a fumigant; causes cancer and liver and lung damage | Synonyms: TCE, trichloroethylene |
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| trichloroethylene | (noun) a heavy colorless highly toxic liquid used as a solvent to clean electronic components and for dry cleaning and as a fumigant; causes cancer and liver and lung damage | Synonyms: TCE, trichloroethane |
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| trichloromethane | (noun) a volatile liquid haloform (CHCl3); formerly used as an anesthetic | Synonyms: chloroform |
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| trifluoromethane | (noun) colorless gas haloform CHF3 (similar to chloroform) | Synonyms: fluoroform |
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| triiodomethane | (noun) a yellowish crystalline solid with a penetrating odor; sometimes used as an antiseptic dressing | Synonyms: iodoform |
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| twentieth | (noun) position 20 in a countable series of things | - |
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| urethane | (noun) an ester of carbamic acid | - |
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| urethra | (noun) duct through which urine is discharged in most mammals and which serves as the male genital duct | - |
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| urethritis | (noun) inflammation of the urethra; results in painful urination | - |
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| urethrocele | (noun) prolapse of the urethra into the vagina | - |
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| wether | (noun) male sheep especially a castrated one | - |
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| whitethorn | (noun) thorny Eurasian shrub of small tree having dense clusters of white to scarlet flowers followed by deep red berries; established as an escape in eastern North America | Synonyms: Crataegus laevigata, Crataegus oxycantha, English hawthorn, may |
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| whitethroat | (noun) common North American finch with a white patch on the throat and black-and-white striped crown | Synonyms: white-throated sparrow, Zonotrichia albicollis |
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| (noun) greyish-brown Old World warbler with a white throat and underparts | Synonyms: greater whitethroat, Sylvia communis |
| (noun) Old World warbler similar to the greater whitethroat but smaller | Synonyms: lesser whitethroat, Sylvia curruca |