| 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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| 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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| 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 | - |
| 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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| reboxetine | (noun) an antidepressant drug that blocks the reuptake of norepinephrine | Synonyms: Edronax |
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| redbone | (noun) a speedy red or red-and-tan American hound | - |
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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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| 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 | (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 |
| 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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| 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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| sailplane | (noun) aircraft supported only by the dynamic action of air against its surfaces | Synonyms: glider |
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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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| sandstone | (noun) a sedimentary rock consisting of sand consolidated with some cement (clay or quartz etc.) | - |
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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 |
| saxophone | (noun) a single-reed woodwind with a conical bore | Synonyms: sax |
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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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| scene | (noun) the painted structures of a stage set that are intended to suggest a particular locale | Synonyms: scenery |
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| (noun) graphic art consisting of the graphic or photographic representation of a visual percept | Synonyms: view |
| (noun) the visual percept of a region | Synonyms: aspect, panorama, prospect, view, vista |
| (noun) a subdivision of an act of a play or performance | - |
| (noun) a consecutive series of pictures that constitutes a unit of action in a film | Synonyms: shot |
| (noun) an incident (real or imaginary) | - |
| (noun) the place where some action occurs | - |
| (noun) the context and environment in which something is set | Synonyms: setting |
| (noun) a situation treated as an observable object | Synonyms: picture |
| (noun) a display of bad temper | Synonyms: conniption, fit, tantrum |
| scone | (noun) small biscuit (rich with cream and eggs) cut into diamonds or sticks and baked in an oven or (especially originally) on a griddle | - |
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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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| seaplane | (noun) an airplane that can land on or take off from water | Synonyms: hydroplane |
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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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| semitone | (noun) the musical interval between adjacent keys on a keyboard instrument | Synonyms: half step |
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| sene | (noun) 100 sene equal 1 tala in Western Samoa | - |
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| serine | (noun) a sweetish crystalline amino acid involved in the synthesis by the body of cysteine | - |
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| serotine | (noun) common brown bat of Europe | Synonyms: Eptesicus serotinus, European brown bat |
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| sertraline | (noun) a selective-serotonin reuptake inhibitor commonly prescribed as an antidepressant (trade name Zoloft) | Synonyms: Zoloft |
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| setline | (noun) a long fishing line with many shorter lines and hooks attached to it (usually suspended between buoys) | Synonyms: spiller, trawl, trawl line, trotline |
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| shaggymane | (noun) common edible mushroom having an elongated shaggy white cap and black spores | Synonyms: Coprinus comatus, shaggy cap, shaggymane mushroom |
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| shinbone | (noun) the inner and thicker of the two bones of the human leg between the knee and ankle | Synonyms: shin, shin bone, tibia |
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| shine | (noun) the quality of being bright and sending out rays of light | Synonyms: effulgence, radiance, radiancy, refulgence, refulgency |
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| shoeshine | (noun) the act of shining shoes | - |
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| (noun) a shiny finish put on shoes with polish and buffing | - |
| shoreline | (noun) a boundary line between land and water | - |
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| shrine | (noun) a place of worship hallowed by association with some sacred thing or person | - |
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| sideline | (noun) an auxiliary activity | Synonyms: avocation, by-line, hobby, pursuit, spare-time activity |
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| (noun) an auxiliary line of merchandise | - |
| (noun) a line that marks the side boundary of a playing field | Synonyms: out of bounds |
| silene | (noun) any plant of the genus Silene | Synonyms: campion, catchfly |
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| silicone | (noun) any of a large class of siloxanes that are unusually stable over a wide range of temperatures; used in lubricants and adhesives and coatings and synthetic rubber and electrical insulation | Synonyms: silicone polymer |
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| siloxane | (noun) any of a large class of compounds that have alternate silicon and oxygen atoms | - |
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| siltstone | (noun) a fine-grained sandstone of consolidated silt | - |
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| silvervine | (noun) ornamental vine of eastern Asia having yellow edible fruit and leaves with silver-white markings | Synonyms: Actinidia polygama, silver vine |
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| simazine | (noun) a herbicide used to control weeds (especially among crops) | - |
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| sine | (noun) ratio of the length of the side opposite the given angle to the length of the hypotenuse of a right-angled triangle | Synonyms: sin |
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| skyline | (noun) the line at which the sky and Earth appear to meet | Synonyms: apparent horizon, horizon, sensible horizon, visible horizon |
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| (noun) the outline of objects seen against the sky | - |
| slackline | (noun) a partially tensioned line for balance or walking | - |
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| smartphone | (noun) a mobile phone with more advanced computing capability and connectivity than basic feature phones | Synonyms: smart phone |
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| snapline | (noun) a chalked string used in the building trades to make a straight line on a vertical surface | Synonyms: chalk line, snap line |
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| soapstone | (noun) a soft heavy compact variety of talc having a soapy feel; used to make hearths and tabletops and ornaments | Synonyms: soap-rock, soaprock, steatite |
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| someone | (noun) a human being; person, singular, assertive existential pronoun; pronoun, person, singular; quantifier: assertive existential | Synonyms: individual, mortal, person, somebody, soul |
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| sone | (noun) a unit of perceived loudness equal to the loudness of a 1000-hertz tone at 40 dB above threshold | - |
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| sourdine | (noun) an organ stop resulting in a soft muted sound | - |
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| (noun) a mute for a violin | Synonyms: sordino |
| sousaphone | (noun) the lowest brass wind instrument | Synonyms: bass horn, tuba |
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