| nifedipine | (noun) calcium blocker (trade name Procardia); appears to increase the risk of recurrent heart attacks | Synonyms: Procardia |
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| nine | (noun) one of four playing cards in a deck with nine pips on the face | Synonyms: nine-spot |
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| (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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| 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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| 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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| nortriptyline | (noun) a tricyclic antidepressant drug (trade name Pamelor) used along with psychotherapy to treat dysthymic depression; may interact dangerously if taken with other drugs | Synonyms: Pamelor |
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| novocaine | (noun) procaine administered as a hydrochloride (trade name Novocain) | Synonyms: Novocain, procaine hydrochloride |
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| olefine | (noun) any unsaturated aliphatic hydrocarbon | Synonyms: alkene, olefin |
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| oleomargarine | (noun) a spread made chiefly from vegetable oils and used as a substitute for butter | Synonyms: margarin, margarine, marge, oleo |
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| olivine | (noun) a mineral consisting of magnesium iron silicate; a source of magnesium | - |
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| ornithine | (noun) an amino acid that does not occur in proteins but is important in the formation of urea | - |
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| orphenadrine | (noun) a skeletal muscle relaxant (trade name Norflex) used to treat severe muscle strain and Parkinsonism | Synonyms: Norflex |
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| orpine | (noun) perennial northern temperate plant with toothed leaves and heads of small purplish-white flowers | Synonyms: live-forever, livelong, orpin, Sedum telephium |
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| oscine | (noun) passerine bird having specialized vocal apparatus | Synonyms: oscine bird |
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| outline | (noun) a schematic or preliminary plan | Synonyms: schema, scheme |
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| (noun) a sketchy summary of the main points of an argument or theory | Synonyms: abstract, precis, synopsis |
| (noun) the line that appears to bound an object | Synonyms: lineation |
| oxyphencyclimine | (noun) an anticholinergic drug (trade name Daricon) used in treating peptic ulcers | Synonyms: Daricon |
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| oxytetracycline | (noun) a yellow crystalline antibiotic (trademark Terramycin) obtained from a soil actinomycete; used to treat various bacterial and rickettsial infections | Synonyms: hydroxytetracycline, oxytetracycline hydrochloride, Terramycin |
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| palatine | (noun) either of two irregularly shaped bones that form the back of the hard palate and helps to form the nasal cavity and the floor of the orbits | Synonyms: os palatinum, palatine bone |
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| (noun) (Middle Ages) the lord of a palatinate who exercised sovereign powers over his lands | Synonyms: palsgrave |
| (noun) any of various important officials in ancient Rome | - |
| papaverine | (noun) an alkaloid medicine (trade name Kavrin) obtained from opium; used to relax smooth muscles; it is nonaddictive | Synonyms: Kavrin |
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| paroxetine | (noun) a selective-serotonin reuptake inhibitor commonly prescribed as an antidepressant (trade name Paxil) | Synonyms: Paxil |
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| passerine | (noun) perching birds mostly small and living near the ground with feet having 4 toes arranged to allow for gripping the perch; most are songbirds; hatchlings are helpless | Synonyms: passeriform bird |
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| penicillamine | (noun) a drug (trade name Cuprimine) used to treat heavy metal poisoning and Wilson's disease and severe arthritis | Synonyms: Cuprimine |
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| pentazocine | (noun) analgesic drug (trade name Talwin) that is less addictive than morphine | Synonyms: Talwin |
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| pentoxifylline | (noun) a drug (trade name Trental) used to treat claudication; believed to increase the flexibility of red blood cells so they can flow through the blood vessels to the legs and feet | Synonyms: Trental |
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| peregrine | (noun) a widely distributed falcon formerly used in falconry | Synonyms: Falco peregrinus, peregrine falcon |
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| perphenazine | (noun) tranquilizer and antidepressant (trade name Triavil) sometimes used as an antiemetic for adults | Synonyms: Triavil |
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| phenazopyridine | (noun) analgesic (trade name Pyridium) used to treat urinary tract infections | Synonyms: Pyridium |
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| phencyclidine | (noun) a drug used as an anesthetic by veterinarians; illicitly taken (originally in the form of powder or `dust') for its effects as a hallucinogen | Synonyms: angel dust, PCP, phencyclidine hydrochloride |
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| phenelzine | (noun) monoamine oxidase inhibitor (trade name Nardil) used to treat clinical depression | Synonyms: Nardil |
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| pheniramine | (noun) an antihistamine used in preparations to treat allergies and respiratory infections; used to treat rhinitis and skin rashes and pruritus | - |
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| phenothiazine | (noun) a compound used primarily in veterinary medicine to rid farm animals of internal parasites | Synonyms: thiodiphenylamine |
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| phentolamine | (noun) a virility drug (trade name Vasomax) to treat erectile dysfunction in men | Synonyms: Vasomax |
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| phenylalanine | (noun) an essential amino acid found in proteins and needed for growth of children and for protein metabolism in children and adults; abundant in milk and eggs; it is normally converted to tyrosine in the human body | - |
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| phenylamine | (noun) oily poisonous liquid amine obtained from nitrobenzene and used to make dyes and plastics and medicines | Synonyms: aminobenzine, aniline, aniline oil |
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| phenylephrine | (noun) a powerful vasoconstrictor used to dilate the pupils and relieve nasal congestion | - |
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| phenylpropanolamine | (noun) an adrenergic drug used in many preparations to relieve allergic reactions or respiratory infections | - |
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| phenyltoloxamine | (noun) antihistamine included in some preparations used to treat coughing and nasal congestion | - |
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| philistine | (noun) a person who is uninterested in intellectual pursuits | Synonyms: anti-intellectual, lowbrow |
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| phosphine | (noun) a colorless gas with a strong fishy smell; used as a pesticide | - |
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| phosphocreatine | (noun) an organic compound of creatine and phosphoric acid; found in the muscles of vertebrates where its hydrolysis releases energy for muscular contraction | Synonyms: creatine phosphate, creatine phosphoric acid |
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| physostigmine | (noun) used in treatment of Alzheimer's disease and glaucoma | - |
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| pilocarpine | (noun) cholinergic alkaloid used in eyedrops to treat glaucoma | - |
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| pine | (noun) a coniferous tree | Synonyms: pine tree, true pine |
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| (noun) straight-grained durable and often resinous white to yellowish timber of any of numerous trees of the genus Pinus | - |
| pipeline | (noun) a pipe used to transport liquids or gases | Synonyms: line |
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| (noun) gossip spread by spoken communication | Synonyms: grapevine, word of mouth |
| piperazine | (noun) vermifuge used to treat infestations by roundworms or pinworms | - |
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| piperine | (noun) derived from pepper (especially black pepper); source of the hotness of black and white pepper | Synonyms: piperin |
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| piperocaine | (noun) a compound used in the form of its hydrochloride as a local or spinal anesthetic | Synonyms: Metycaine, piperocaine hydrochloride |
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| platyrrhine | (noun) hairy-faced arboreal monkeys having widely separated nostrils and long usually prehensile tails | Synonyms: New World monkey, platyrrhinian |
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| porcupine | (noun) relatively large rodents with sharp erectile bristles mingled with the fur | Synonyms: hedgehog |
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| poutine | (noun) a Canadian dish made with french fries and cheese curds topped with a light brown gravy | - |
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| praline | (noun) cookie-sized candy made of brown sugar and butter and pecans | - |
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| primaquine | (noun) synthetic antimalarial drug | - |
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| procaine | (noun) a white crystalline powder (trade name Ethocaine) administered near nerves as a local anesthetic in dentistry and medicine | Synonyms: Ethocaine |
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| procarbazine | (noun) an antineoplastic drug used to treat Hodgkin's disease | - |
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| prochlorperazine | (noun) antipsychotic and antiemetic drug used to treat schizophrenia and to combat nausea and vomiting | - |
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| procyclidine | (noun) drug (trade name Kemadrin) used to reduce tremors in Parkinsonism | Synonyms: Kemadrin |
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| prolamine | (noun) a simple protein found in plants | - |
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| proline | (noun) an amino acid that is found in many proteins (especially collagen) | - |
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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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| protamine | (noun) a simple protein found in fish sperm; rich in arginine; simpler in composition than globulin or albumin; counteracts the anticoagulant effect of heparin | - |
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| protriptyline | (noun) tricyclic antidepressant used to treat clinical depression | - |
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| pseudoephedrine | (noun) poisonous crystalline alkaloid occurring with ephedrine and isomorphic with it | - |
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| psilocine | (noun) a substituted tryptamine alkaloid and a serotonergic psychedelic substance, present in most psychedelic mushrooms together with its phosphorylated counterpart psilocybin. | Synonyms: psilocin, psilocyn, psilotsin |
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| ptomaine | (noun) a term for food poisoning that is no longer in scientific use; food poisoning was once thought to be caused by ingesting ptomaines | Synonyms: ptomaine poisoning |
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| (noun) any of various amines (such as putrescine or cadaverine) formed by the action of putrefactive bacteria | Synonyms: ptomain |
| purine | (noun) a colorless crystalline organic base containing nitrogen; the parent compound of various biologically important substances | - |
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| (noun) any of several bases that are derivatives of purine | - |
| putrescine | (noun) a colorless crystalline ptomaine with a foul odor that is produced in decaying animal matter | - |
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| pyridine | (noun) a toxic colorless flammable liquid organic base with a disagreeable odor; usually derived from coal | - |
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| pyridoxamine | (noun) a B vitamin that is essential for metabolism of amino acids and starch | Synonyms: adermin, pyridoxal, pyridoxine, vitamin B6 |
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| pyridoxine | (noun) a B vitamin that is essential for metabolism of amino acids and starch | Synonyms: adermin, pyridoxal, pyridoxamine, vitamin B6 |
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| pyrilamine | (noun) antihistamine used to treat rhinitis and pruritus | - |
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| pyrimidine | (noun) a heterocyclic organic compound with a penetrating odor | - |
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| (noun) any of several basic compounds derived from pyrimidine | - |
| pyroxyline | (noun) highly flammable nitrocellulose used in making collodion and plastics and lacquers | Synonyms: pyroxylin |
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| pyrrhotine | (noun) a brownish iron sulfide mineral (FeS) having weak magnetic properties | Synonyms: magnetic pyrites, pyrrhotite |
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| quarantine | (noun) isolation to prevent the spread of infectious disease | - |
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| (noun) enforced isolation of patients suffering from a contagious disease in order to prevent the spread of disease | - |
| quartervine | (noun) woody flowering vine of southern United States; stems show a cross in transverse section | Synonyms: Bignonia capreolata, cross vine, quarter-vine, trumpet flower |
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| quinacrine | (noun) a drug (trade name Atabrine) used to treat certain worm infestations and once used to treat malaria | Synonyms: Atabrine, mepacrine, quinacrine hydrochloride |
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| quinidine | (noun) cardiac drug (trade names Quinidex and Quinora) used to treat certain heart arrhythmias | Synonyms: Quinidex, Quinora |
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| quinine | (noun) a bitter alkaloid extracted from chinchona bark; used in malaria therapy | - |
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| radiochlorine | (noun) a radioactive isotope of chlorine | - |
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| ranitidine | (noun) a histamine blocker and antacid (trade name Zantac) used to treat peptic ulcers and gastritis and esophageal reflux | Synonyms: Zantac |
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| rapine | (noun) the act of despoiling a country in warfare | Synonyms: rape |
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| ratline | (noun) (nautical) a small horizontal rope between the shrouds of a sailing ship; they form a ladder for climbing aloft | Synonyms: ratlin |
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| ravine | (noun) a deep narrow steep-sided valley (especially one formed by running water) | - |
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| reboxetine | (noun) an antidepressant drug that blocks the reuptake of norepinephrine | Synonyms: Edronax |
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| reserpine | (noun) antihypertensive consisting of an alkaloid extracted from the plant Rauwolfia serpentina (trade names Raudixin or Rau-Sed or Sandril or Serpasil) | Synonyms: Rau-Sed, Raudixin, Sandril, Serpasil |
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| ridgeline | (noun) a long narrow range of hills | Synonyms: ridge |
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| romaine | (noun) lettuce with long dark-green leaves in a loosely packed elongated head | Synonyms: cos, cos lettuce, romaine lettuce |
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| routine | (noun) an unvarying or habitual method or procedure | Synonyms: modus operandi |
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| (noun) a set sequence of steps, part of larger computer program | Synonyms: function, procedure, subprogram, subroutine |
| (noun) a short performance that is part of a longer program | Synonyms: act, bit, number, turn |
| saffranine | (noun) any of a class of chiefly red organic dyes | Synonyms: safranin, safranine |
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| safranine | (noun) any of a class of chiefly red organic dyes | Synonyms: saffranine, safranin |
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| saline | (noun) an isotonic solution of sodium chloride and distilled water | Synonyms: saline solution |
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| saltine | (noun) a cracker sprinkled with salt before baking | - |
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| sanguine | (noun) chalk of a reddish-brown colour that resembles dried blood | Synonyms: red chalk |
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| (noun) a blood-red color | - |
| sapphirine | (noun) a rare light blue or green mineral; consists of aluminum and magnesium silicate and occurs as small grains in some metamorphic rocks | - |
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| sarcodine | (noun) protozoa that move and capture food by forming pseudopods | Synonyms: sarcodinian |
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| sarcosine | (noun) a sweetish crystalline amino acid | - |
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| sardine | (noun) any of various small edible herring or related food fishes frequently canned | - |
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| (noun) small fishes found in great schools along coasts of Europe; smaller and rounder than herring | Synonyms: pilchard, Sardina pilchardus |
| (noun) small fatty fish usually canned | Synonyms: pilchard |
| (noun) a deep orange-red variety of chalcedony | Synonyms: sard, sardius |
| scallopine | (noun) sauteed cutlets (usually veal or poultry) that have been pounded thin and coated with flour | Synonyms: scallopini |
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| scopolamine | (noun) an alkaloid with anticholinergic effects that is used as a sedative and to treat nausea and to dilate the pupils in ophthalmic procedures | Synonyms: hyoscine |
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