| 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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| 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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| obscene | (adjective) suggestive of or tending to moral looseness | Synonyms: lewd, raunchy, salacious |
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| (adjective) designed to incite to indecency or lust | - |
| (adjective) offensive to the mind | Synonyms: abhorrent, detestable, repugnant, repulsive |
| octane | (noun) any isomeric saturated hydrocarbon found in petroleum and used as a fuel and solvent | - |
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| oestrone | (noun) a naturally occurring weak estrogenic hormone secreted by the mammalian ovary; synthesized (trade name Estronol) and used to treat estrogen deficiency | Synonyms: estrone, Estronol, theelin |
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| oilstone | (noun) a whetstone for use with oil | - |
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| oldline | (adjective) long-established | Synonyms: old-line |
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| (adjective) adhering to conservative or reactionary principles | Synonyms: old-line |
| 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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| oncogene | (noun) a gene that disposes normal cells to change into cancerous tumor cells | Synonyms: transforming gene |
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| one | (adjective) used of a single unit or thing; not two or more | Synonyms: 1, ane, i |
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| (adjective) being a single entity made by combining separate components | - |
| (adjective) (informal) very; used informally as an intensifier | Synonyms: right |
| (adjective) eminent beyond or above comparison | Synonyms: matchless, nonpareil, one and only, peerless, unmatchable, unmatched, unrivaled, unrivalled |
| (adjective) indefinite in time or position | - |
| (adjective) of the same kind or quality | - |
| (adjective) having the indivisible character of a unit | Synonyms: unitary |
| (noun) a single person or thing | - |
| (noun) the smallest whole number or a numeral representing this number | Synonyms: 1, ace, I, single, unity |
| online | (adjective) connected to a computer network or accessible by computer | Synonyms: on-line |
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| (adjective) on a regular route of a railroad or bus or airline system | Synonyms: on-line |
| (adjective) being in progress now | Synonyms: on-line |
| opaline | (adjective) having a play of lustrous rainbow colors | Synonyms: iridescent, nacreous, opalescent, pearlescent |
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| opine | (verb) expect, believe, or suppose | Synonyms: guess, imagine, reckon, suppose, think |
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| (verb) express one's opinion openly and without fear or hesitation | Synonyms: animadvert, sound off, speak out, speak up |
| opportune | (adjective) suitable or at a time that is suitable or advantageous especially for a particular purpose | - |
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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 | (adjective) of or relating to the songbirds | - |
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| (noun) passerine bird having specialized vocal apparatus | Synonyms: oscine bird |
| 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 |
| (verb) describe roughly or briefly or give the main points or summary of | Synonyms: adumbrate, sketch |
| (verb) trace the shape of | Synonyms: delineate, limn |
| (verb) draw up an outline or sketch for something | Synonyms: draft |
| outshine | (verb) attract more attention and praise than others | - |
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| (verb) shine brighter than | - |
| overdone | (adjective) cooked too long but still edible | - |
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| (adjective) represented as greater than is true or reasonable | Synonyms: exaggerated, overstated |
| overrefine | (verb) refine too much or with excess of subtlety | Synonyms: over-refine |
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| overtone | (noun) a harmonic with a frequency that is a multiple of the fundamental frequency | Synonyms: partial, partial tone |
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| (noun) (usually plural) an ulterior implicit meaning or quality | - |
| ovine | (adjective) of or pertaining to or of the nature of or characteristic of a sheep or sheep | - |
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| oxyacetylene | (noun) a mixture of oxygen and acetylene; used to create high temperatures for cutting or welding metals | - |
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| oxybenzene | (noun) a toxic white soluble crystalline acidic derivative of benzene; used in manufacturing and as a disinfectant and antiseptic; poisonous if taken internally | Synonyms: carbolic acid, hydroxybenzene, phenol, phenylic acid |
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| oxyphenbutazone | (noun) an anti-inflammatory drug (trade name Tandearil) used to treat arthritis and bursitis | Synonyms: Tandearil |
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| 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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| oxytone | (noun) word having stress or an acute accent on the last syllable | - |
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| ozone | (noun) a colorless gas (O3) soluble in alkalis and cold water; a strong oxidizing agent; can be produced by electric discharge in oxygen or by the action of ultraviolet radiation on oxygen in the stratosphere (where it acts as a screen for ultraviolet radiation) | - |
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| pachytene | (noun) the third stage of the prophase of meiosis | - |
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| padrone | (noun) an owner or proprietor of an inn in Italy | - |
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| (noun) an employer who exploits Italian immigrants in the U.S. | - |
| palatine | (adjective) of or relating to a palace | - |
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| (adjective) of or relating to a count palatine and his royal prerogatives | - |
| (adjective) relating to or lying near the palate | Synonyms: palatal |
| (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 |
| (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 | - |
| pallone | (noun) an Italian game similar to tennis | - |
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| pane | (noun) sheet glass cut in shapes for windows or doors | Synonyms: pane of glass, window glass |
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| (noun) a panel or section of panels in a wall or door | Synonyms: paneling, panelling |
| (noun) street name for lysergic acid diethylamide | Synonyms: acid, back breaker, battery-acid, dose, dot, Elvis, loony toons, Lucy in the sky with diamonds, superman, window pane, Zen |
| 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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| parathormone | (noun) hormone synthesized and released into the blood stream by the parathyroid glands; regulates phosphorus and calcium in the body and functions in neuromuscular excitation and blood clotting | Synonyms: parathyroid hormone |
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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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| paroxytone | (noun) word having stress or acute accent on the next to last syllable | - |
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| passerine | (adjective) relating to or characteristic of the passeriform birds | - |
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| (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 |
| patronne | (noun) a woman who is a patron or the wife of a patron | Synonyms: patroness |
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| pavane | (noun) a stately court dance of the 16th and 17th centuries | Synonyms: pavan |
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| (noun) music composed for dancing the pavane | Synonyms: pavan |
| peneplane | (noun) a more or less level land surface representing an advanced stage of erosion undisturbed by crustal movements | Synonyms: peneplain |
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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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| penne | (noun) pasta in short tubes with diagonally cut ends | - |
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| pentatone | (noun) a gapped scale with five notes; usually the fourth and seventh notes of the diatonic scale are omitted | Synonyms: pentatonic scale |
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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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| peptone | (noun) any of various water-soluble compounds that form by hydrolysis in the digestion of proteins to amino acids | - |
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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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| peregrine | (adjective) migratory | Synonyms: mobile, nomadic, roving, wandering |
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| (noun) a widely distributed falcon formerly used in falconry | Synonyms: Falco peregrinus, peregrine falcon |
| perigone | (noun) collective term for the outer parts of a flower consisting of the calyx and corolla and enclosing the stamens and pistils | Synonyms: chlamys, floral envelope, perianth, perigonium |
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| perilune | (noun) periapsis in orbit around the moon | Synonyms: periselene |
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| periselene | (noun) periapsis in orbit around the moon | Synonyms: perilune |
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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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| phenobarbitone | (noun) a long-acting barbiturate used as a sedative | Synonyms: Luminal, phenobarbital, purple heart, sodium thiopental |
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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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| phenylbutazone | (noun) anti-inflammatory drug (trade name Butazolidin) | Synonyms: Butazolidin |
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| phenylephrine | (noun) a powerful vasoconstrictor used to dilate the pupils and relieve nasal congestion | - |
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| phenylethylene | (noun) a colorless oily liquid; the monomer for polystyrene | Synonyms: cinnamene, styrene, vinylbenzene |
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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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| pheromone | (noun) a chemical substance secreted externally by some animals (especially insects) that influences the physiology or behavior of other animals of the same species | - |
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| philhellene | (adjective) characterized by a love of Greece and Grecian things | Synonyms: Graecophile, Graecophilic, philhellenic |
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| (noun) an admirer of Greece and everything Greek | Synonyms: Graecophile, philhellenist |
| philistine | (adjective) smug and ignorant and indifferent or hostile to artistic and cultural values | Synonyms: anti-intellectual |
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| (noun) a person who is uninterested in intellectual pursuits | Synonyms: anti-intellectual, lowbrow |
| phocine | (adjective) of or relating to seals | - |
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| phone | (noun) electronic equipment that converts sound into electrical signals that can be transmitted over distances and then converts received signals back into sounds | Synonyms: telephone, telephone set |
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| (noun) electro-acoustic transducer for converting electric signals into sounds; it is held over or inserted into the ear | Synonyms: earphone, earpiece, headphone |
| (noun) (phonetics) an individual sound unit of speech without concern as to whether or not it is a phoneme of some language | Synonyms: sound, speech sound |
| (verb) get or try to get into communication (with someone) by telephone | Synonyms: call, call up, ring, telephone |
| phosgene | (noun) a colorless poisonous gas that smells like new-mown hay; used in chemical warfare | - |
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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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| phragmacone | (noun) the thin conical chambered internal shell (either straight or curved) of a belemnite | Synonyms: phragmocone |
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| phragmocone | (noun) the thin conical chambered internal shell (either straight or curved) of a belemnite | Synonyms: phragmacone |
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| phylloquinone | (noun) a form of vitamin K, based on 2-methyl-1,4-naphthoquinone, with a 3-phytyl substituent | Synonyms: phytonadione, vitamin K1 |
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| physostigmine | (noun) used in treatment of Alzheimer's disease and glaucoma | - |
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| phytohormone | (noun) (botany) a plant product that acts like a hormone | Synonyms: growth regulator, plant hormone |
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| phytonadione | (noun) a form of vitamin K, based on 2-methyl-1,4-naphthoquinone, with a 3-phytyl substituent | Synonyms: phylloquinone, vitamin K1 |
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| picayune | (adjective) (informal) small and of little importance | Synonyms: fiddling, footling, lilliputian, little, niggling, petty, piddling, piffling, trivial |
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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 | - |
| (verb) have a desire for something or someone who is not present | Synonyms: ache, languish, yearn, yen |
| pinecone | (noun) the seed-producing cone of a pine tree | - |
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| 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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| piscine | (adjective) of or relating to fish | - |
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| pistonphone | (noun) an acoustical calibrator (sound source) that uses a closed coupling volume to generate a precise sound pressure for the calibration of measurement microphones. | - |
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| pitchstone | (noun) dark acid granitic glass | - |
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| plane | (adjective) having a surface without slope, tilt in which no part is higher or lower than another | Synonyms: flat, level |
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| (noun) a carpenter's hand tool with an adjustable blade for smoothing or shaping wood | Synonyms: carpenter's plane, woodworking plane |
| (noun) an aircraft that has a fixed wing and is powered by propellers or jets | Synonyms: aeroplane, airplane |
| (noun) a power tool for smoothing or shaping wood | Synonyms: planer, planing machine |
| (noun) (mathematics) an unbounded two-dimensional shape | Synonyms: sheet |
| (noun) a level of existence or development | - |
| (verb) cut or remove with or as if with a plane | Synonyms: shave |
| (verb) make even or smooth, with or as with a carpenter's plane | - |
| (verb) travel on the surface of water | Synonyms: skim |
| platyrhine | (adjective) of or related to New World monkeys having nostrils far apart or to people with broad noses | Synonyms: broadnosed, platyrhinian, platyrrhine, platyrrhinian, platyrrhinic |
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