| 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 | (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 |
| 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 | (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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| 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 | - |
| (verb) have a desire for something or someone who is not present | Synonyms: ache, languish, yearn, yen |
| 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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| 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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| 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 |
| polycrystalline | (adjective) composed of aggregates of crystals | - |
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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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| 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 |
| primaquine | (noun) synthetic antimalarial drug | - |
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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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| 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 | - |
| (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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| 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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| 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 | - |
| 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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| 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 | (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 |
| 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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| safranine | (noun) any of a class of chiefly red organic dyes | Synonyms: saffranine, safranin |
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| saline | (adjective) containing salt | - |
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| (noun) an isotonic solution of sodium chloride and distilled water | Synonyms: saline solution |
| saltine | (noun) a cracker sprinkled with salt before baking | - |
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| sanguine | (adjective) inclined to a healthy reddish color often associated with outdoor life | Synonyms: florid, rubicund, ruddy |
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| (adjective) confidently optimistic and cheerful | Synonyms: sanguineous |
| (noun) chalk of a reddish-brown colour that resembles dried blood | Synonyms: red chalk |
| (noun) a blood-red color | - |
| sapphirine | (adjective) made of or resembling sapphire | - |
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| (noun) a rare light blue or green mineral; consists of aluminum and magnesium silicate and occurs as small grains in some metamorphic rocks | - |
| 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 |
| saturnine | (adjective) showing a brooding ill humor | Synonyms: dark, dour, glowering, glum, moody, morose, sour, sullen |
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| (adjective) bitter or scornful | - |
| saxicoline | (adjective) growing on or living among rocks | Synonyms: saxatile, saxicolous |
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| 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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| seine | (noun) a large fishnet that hangs vertically, with floats at the top and weights at the bottom | - |
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| (verb) fish with a seine; catch fish with a seine | - |
| sepaline | (adjective) resembling or characteristic of a sepal | Synonyms: sepaloid |
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