| platyrrhine | (adjective) of or related to New World monkeys having nostrils far apart or to people with broad noses | Synonyms: broadnosed, platyrhine, platyrhinian, platyrrhinian, platyrrhinic |
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| (noun) hairy-faced arboreal monkeys having widely separated nostrils and long usually prehensile tails | Synonyms: New World monkey, platyrrhinian |
| polybutene | (noun) a polymer of butylene; used in lubricants and synthetic rubber | Synonyms: polybutylene |
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| polybutylene | (noun) a polymer of butylene; used in lubricants and synthetic rubber | Synonyms: polybutene |
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| polycrystalline | (adjective) composed of aggregates of crystals | - |
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| polyethylene | (noun) a lightweight thermoplastic; used especially in packaging and insulation | Synonyms: polythene |
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| polygene | (noun) a gene that by itself has little effect on the phenotype but which can act together with others to produce observable variations | - |
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| polyphone | (noun) a letter that has two or more pronunciations | Synonyms: polyphonic letter |
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| polypropene | (noun) a polymer of propylene used as a thermoplastic molding material | Synonyms: polypropylene |
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| polypropylene | (noun) a polymer of propylene used as a thermoplastic molding material | Synonyms: polypropene |
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| polystyrene | (noun) a polymer of styrene; a rigid transparent thermoplastic | - |
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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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| polythene | (noun) a lightweight thermoplastic; used especially in packaging and insulation | Synonyms: polyethylene |
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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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| pone | (noun) cornbread often made without milk or eggs and baked or fried (southern) | Synonyms: cornpone |
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| porcine | (adjective) relating to or suggesting swine | - |
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| (adjective) repellently fat | Synonyms: gross |
| (adjective) resembling swine; coarsely gluttonous or greedy | Synonyms: hoggish, piggish, piggy, swinish |
| porcupine | (noun) relatively large rodents with sharp erectile bristles mingled with the fur | Synonyms: hedgehog |
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| postpone | (verb) hold back to a later time | Synonyms: defer, hold over, prorogue, put off, put over, remit, set back, shelve, table |
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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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| predestine | (verb) foreordain or determine beforehand | Synonyms: foreordain, preordain |
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| (verb) foreordain by divine will or decree | Synonyms: foreordain, predestinate |
| (verb) decree or determine beforehand | - |
| predetermine | (verb) determine beforehand | - |
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| (verb) cause to be biased | Synonyms: bias |
| prednisolone | (noun) a glucocorticoid (trade names Pediapred or Prelone) used to treat inflammatory conditions | Synonyms: Pediapred, Prelone |
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| prednisone | (noun) a dehydrogenated analogue of cortisol (trade names Orasone or Deltasone or Liquid Pred or Meticorten); used as an anti-inflammatory drug in the treatment of arthritis and as an immunosuppressant | Synonyms: Deltasone, Liquid Pred, Meticorten, Orasone |
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| primaquine | (noun) synthetic antimalarial drug | - |
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| primidone | (noun) an anticonvulsant (trade name Mysoline) used to treat grand mal seizures and essential tremor | Synonyms: Mysoline |
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| pristine | (adjective) immaculately clean and unused | - |
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| (adjective) completely free from dirt or contamination | - |
| 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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| profane | (adjective) not concerned with or devoted to religion | Synonyms: secular |
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| (adjective) characterized by profanity or cursing | Synonyms: blasphemous, blue |
| (adjective) grossly irreverent toward what is held to be sacred | Synonyms: blasphemous, sacrilegious |
| (adjective) not holy because unconsecrated or impure or defiled | Synonyms: unconsecrated, unsanctified |
| (verb) violate the sacred character of a place or language | Synonyms: desecrate, outrage, violate |
| (verb) corrupt morally or by intemperance or sensuality | Synonyms: corrupt, debase, debauch, demoralise, demoralize, deprave, misdirect, pervert, subvert, vitiate |
| progesterone | (noun) a steroid hormone (trade name Lipo-Lutin) produced in the ovary; prepares and maintains the uterus for pregnancy | Synonyms: Lipo-Lutin |
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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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| prone | (adjective) having a tendency (to); often used in combination | - |
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| (adjective) lying face downward | Synonyms: prostrate |
| propane | (noun) colorless gas found in natural gas and petroleum; used as a fuel | - |
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| propanone | (noun) the simplest ketone; a highly flammable liquid widely used as an organic solvent and as material for making plastics | Synonyms: acetone, dimethyl ketone |
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| proparoxytone | (noun) word having stress or acute accent on the antepenult | - |
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| propene | (noun) a flammable gas obtained by cracking petroleum; used in organic synthesis | Synonyms: propylene |
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| propoxyphene | (noun) a mildly narcotic analgesic drug (trade name Darvon) related to methadone but less addictive | Synonyms: Darvon, propoxyphene hydrochloride |
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| propylene | (noun) a flammable gas obtained by cracking petroleum; used in organic synthesis | Synonyms: propene |
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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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| prune | (noun) dried plum | - |
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| (verb) weed out unwanted or unnecessary things | Synonyms: cut, rationalise, rationalize |
| (verb) cultivate, tend, and cut back the growth of | Synonyms: clip, crop, cut back, dress, lop, snip, trim |
| 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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| psilomelane | (noun) a mineral consisting of hydrated basic oxide of manganese and barium; a source of manganese | - |
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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 | - |
| purslane | (noun) a plant of the family Portulacaceae having fleshy succulent obovate leaves often grown as a potherb or salad herb; a weed in some areas | - |
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| putrescine | (noun) a colorless crystalline ptomaine with a foul odor that is produced in decaying animal matter | - |
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| pyrene | (noun) the small hard nutlet of a drupe or drupelet; the seed and the hard endocarp that surrounds it | - |
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| (noun) a pale yellow crystalline hydrocarbon C16H10 extracted from coal tar | - |
| 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 | - |
| pyroxene | (noun) any of a group of crystalline silicate mineral common in igneous and metamorphic rocks | - |
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| 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 | - |
| (verb) place into enforced isolation, as for medical reasons | - |
| 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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| quinone | (noun) any of a class of aromatic yellow compounds including several that are biologically important as coenzymes or acceptors or vitamins; used in making dyes | Synonyms: benzoquinone |
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| radiochlorine | (noun) a radioactive isotope of chlorine | - |
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| radiophone | (noun) a telephone that communicates by radio waves rather than along cables | Synonyms: radiotelephone, wireless telephone |
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| radiotelephone | (noun) a telephone that communicates by radio waves rather than along cables | Synonyms: radiophone, wireless telephone |
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| (noun) telephony that uses transmission by radio rather than by wire | Synonyms: radiotelephony, wireless telephone |
| 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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| ratsbane | (noun) a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer | Synonyms: arsenic, arsenic trioxide, arsenous anhydride, arsenous oxide, white arsenic |
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| ravine | (noun) a deep narrow steep-sided valley (especially one formed by running water) | - |
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| realine | (verb) align anew or better | Synonyms: realign |
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| reboxetine | (noun) an antidepressant drug that blocks the reuptake of norepinephrine | Synonyms: Edronax |
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| recline | (verb) lean in a comfortable resting position | Synonyms: recumb, repose |
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| (verb) cause to recline | - |
| (verb) move the upper body backwards and down | Synonyms: lean back |
| recombine | (verb) undergo genetic recombination | - |
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| (verb) cause genetic recombination | - |
| (verb) to combine or put together again | - |
| reconvene | (verb) meet again | - |
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| redbone | (noun) a speedy red or red-and-tan American hound | - |
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| redefine | (verb) give a new or different definition of (a word) | - |
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| (verb) give a new or different definition to | - |
| redetermine | (verb) fix, find, or establish again | - |
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| redline | (verb) discriminate in selling or renting housing in certain areas of a neighborhood | - |
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| reexamine | (verb) look at again; examine again | Synonyms: review |
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| refine | (verb) reduce to a fine, unmixed, or pure state; separate from extraneous matter or cleanse from impurities | Synonyms: rectify |
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| (verb) improve or perfect by pruning or polishing | Synonyms: down, fine-tune, polish |
| (verb) treat or prepare so as to put in a usable condition | - |
| (verb) attenuate or reduce in vigor, strength, or intensity by polishing or purifying | - |
| (verb) make more precise or increase the discriminatory powers of | - |
| (verb) make more complex, intricate, or richer | Synonyms: complicate, elaborate, rarify |
| reline | (verb) put new lines on | - |
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| (verb) provide with a new lining | - |
| repine | (verb) express discontent | - |
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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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| resupine | (adjective) lying face upward | Synonyms: supine |
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| retinene | (noun) either of two yellow to red retinal pigments formed from rhodopsin by the action of light | Synonyms: retinal |
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| rhinestone | (noun) an imitation diamond made from rock crystal or glass or paste | - |
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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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| rotenone | (noun) a white crystalline insecticide that has low toxicity for mammals; is used in home gardens; extracted from the roots of derris and cube | - |
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| rottenstone | (noun) a weathered and decomposed siliceous limestone; in powdered form it is used in polishing | Synonyms: tripoli |
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| routine | (adjective) found in the ordinary course of events | Synonyms: everyday, mundane, quotidian, unremarkable, workaday |
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| (noun) an unvarying or habitual method or procedure | Synonyms: modus operandi |
| (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 |
| rune | (noun) any character from an ancient Germanic alphabet used in Scandinavia from the 3rd century to the Middle Ages | Synonyms: runic letter |
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| saccharine | (adjective) overly sweet | Synonyms: cloying, syrupy, treacly |
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| saffranine | (noun) any of a class of chiefly red organic dyes | Synonyms: safranin, safranine |
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