| protoactinium | (noun) a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead | Synonyms: atomic number 91, Pa, protactinium |
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| psalterium | (noun) the third compartment of the stomach of a ruminant | Synonyms: omasum, third stomach |
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| pseudopodium | (noun) temporary outgrowth used by some microorganisms as an organ of feeding or locomotion | Synonyms: pseudopod |
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| psyllium | (noun) plantain of Mediterranean regions whose seeds swell and become gelatinous when moist and are used as a mild laxative | Synonyms: fleawort, Plantago psyllium, Spanish psyllium |
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| pterygium | (noun) either of two thickened triangular layers of conjunctiva extending from the nasal edge of the eye to the cornea; it arises from irritation of the pinguecula | - |
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| pudendum | (noun) human external genital organs collectively especially of a female | - |
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| puerperium | (noun) time period following childbirth when the mother's uterus shrinks and the other functional and anatomic changes of pregnancy are resolved | - |
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| punctum | (noun) (anatomy) a point or small area | - |
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| purificatorium | (noun) a white linen cloth which is used to wipe the chalice after each communicant partakes. | Synonyms: emunctorium, purificator |
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| pycnidium | (noun) flask-shaped asexual structure containing conidia | - |
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| pyrethrum | (noun) spring-flowering garden perennial of Asiatic origin having finely divided aromatic leaves and white to pink-purple flowers; source of an insecticide; sometimes placed in genus Chrysanthemum | Synonyms: Chrysanthemum coccineum, painted daisy, Tanacetum coccineum |
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| (noun) white-flowered pyrethrum of Balkan area whose pinnate leaves are white and silky-hairy below; source of an insecticide; sometimes placed in genus Chrysanthemum | Synonyms: Chrysanthemum cinerariifolium, Dalmatia pyrethrum, Dalmatian pyrethrum, Tanacetum cinerariifolium |
| (noun) made of dried flower heads of pyrethrum plants | - |
| pythium | (noun) any fungus of the genus Pythium | - |
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| pyxidium | (noun) fruit of such plants as the plantain; a capsule whose upper part falls off when the seeds are released | Synonyms: pyxis |
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| quadrennium | (noun) a period of four years | - |
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| quadrivium | (noun) (Middle Ages) a higher division of the curriculum in a medieval university involving arithmetic and music and geometry and astronomy | - |
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| quantum | (noun) (physics) the smallest discrete quantity of some physical property that a system can possess (according to quantum theory) | - |
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| (noun) a discrete amount of something that is analogous to the quantities in quantum theory | - |
| quinquennium | (noun) a period of five years | - |
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| quorum | (noun) a gathering of the minimal number of members of an organization to conduct business | - |
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| radiothorium | (noun) radioactive isotope of thorium with mass number 228 | Synonyms: thorium-228 |
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| radium | (noun) an intensely radioactive metallic element that occurs in minute amounts in uranium ores | Synonyms: atomic number 88, Ra |
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| rectum | (noun) the terminal section of the alimentary canal; from the sigmoid flexure to the anus | - |
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| referendum | (noun) a legislative act is referred for final approval to a popular vote by the electorate | - |
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| regnellidium | (noun) small latex-containing aquatic fern of southern Brazil | Synonyms: Regnellidium diphyllum |
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| relatum | (noun) a term in a proposition that is related to the referent of the proposition | - |
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| residuum | (noun) something left after other parts have been taken away | Synonyms: balance, remainder, residual, residue, rest |
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| reticulum | (noun) the second compartment of the stomach of a ruminant | Synonyms: second stomach |
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| (noun) any fine network (especially one in the body composed of cells or blood vessels) | - |
| rhenium | (noun) a rare heavy polyvalent metallic element that resembles manganese chemically and is used in some alloys; is obtained as a by-product in refining molybdenum | Synonyms: atomic number 75, Re |
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| rheum | (noun) a watery discharge from the mucous membranes (especially from the eyes or nose) | - |
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| rhodium | (noun) a white hard metallic element that is one of the platinum group and is found in platinum ores; used in alloys with platinum | Synonyms: atomic number 45, Rh |
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| roentgenium | (noun) a radioactive transuranic element, with atomic number 111 | Synonyms: atomic number 111, element 111, Rg |
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| rostrum | (noun) beaklike projection of the anterior part of the head of certain insects such as e.g. weevils | Synonyms: snout |
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| (noun) a platform raised above the surrounding level to give prominence to the person on it | Synonyms: ambo, dais, podium, pulpit, soapbox, stump |
| rubidium | (noun) a soft silvery metallic element of the alkali metal group; burns in air and reacts violently in water; occurs in carnallite and lepidolite and pollucite | Synonyms: atomic number 37, Rb |
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| rum | (adjective) beyond or deviating from the usual or expected | Synonyms: curious, funny, odd, peculiar, queer, rummy, singular |
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| (noun) a card game based on collecting sets and sequences; the winner is the first to meld all their cards | Synonyms: rummy |
| (noun) liquor distilled from fermented molasses | - |
| ruthenium | (noun) a rare polyvalent metallic element of the platinum group; it is found associated with platinum | Synonyms: atomic number 44, Ru |
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| rutherfordium | (noun) a radioactive transuranic element which has been synthesized | Synonyms: atomic number 104, element 104, Rf, unnilquadium, Unq |
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| sacrum | (noun) wedge-shaped bone consisting of five fused vertebrae forming the posterior part of the pelvis; its base connects with the lowest lumbar vertebra and its tip with the coccyx | - |
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| samarium | (noun) a grey lustrous metallic element of the rare earth group; is used in special alloys; occurs in monazite and bastnasite | Synonyms: atomic number 62, Sm |
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| sanatarium | (noun) a hospital for recuperation or for the treatment of chronic diseases | Synonyms: sanatorium, sanitarium |
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| sanatorium | (noun) a hospital for recuperation or for the treatment of chronic diseases | Synonyms: sanatarium, sanitarium |
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| (noun) pejorative terms for an insane asylum | Synonyms: Bedlam, booby hatch, crazy house, cuckoo's nest, funny farm, funny house, loony bin, madhouse, nut house, nuthouse, snake pit |
| sanctum | (noun) a place of inviolable privacy | Synonyms: sanctum sanctorum |
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| (noun) a sacred place of pilgrimage | Synonyms: holy, holy place |
| sangapenum | (noun) a variety of gum | Synonyms: gum sangapenum |
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| sanitarium | (noun) a hospital for recuperation or for the treatment of chronic diseases | Synonyms: sanatarium, sanatorium |
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| sargassum | (noun) brown algae with rounded bladders forming dense floating masses in tropical Atlantic waters as in the Sargasso Sea | Synonyms: gulfweed, sargasso, Sargassum bacciferum |
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| scandium | (noun) a white trivalent metallic element; sometimes classified in the rare earth group; occurs in the Scandinavian mineral thortveitite | Synonyms: atomic number 21, Sc |
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| scholium | (noun) a marginal note written by a scholiast (a commentator on ancient or classical literature) | Synonyms: scholia |
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| sclerotium | (noun) compact usually dark-colored mass of hardened mycelium constituting a vegetative food-storage body in various true fungi; detaches when mature and can give rise to new growth | - |
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| scolopendrium | (noun) a fern thought to resemble a millipede | - |
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| scriptorium | (noun) a room in a monastery that is set aside for writing or copying manuscripts | - |
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| scrotum | (noun) the external pouch that contains the testes | - |
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| scrum | (noun) (rugby) the method of beginning play in which the forwards of each team crouch side by side with locked arms; play starts when the ball is thrown in between them and the two sides compete for possession | Synonyms: scrummage |
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| scum | (noun) a film of impurities or vegetation that can form on the surface of a liquid | - |
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| (noun) worthless people | Synonyms: trash |
| (verb) remove the scum from | - |
| seaborgium | (noun) a transuranic element with atomic number 106 | Synonyms: atomic number 106, element 106, Sg |
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| sebum | (noun) the oily secretion of the sebaceous glands; with perspiration it moistens and protects the skin | - |
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| sedum | (noun) any of various plants of the genus Sedum | - |
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| selenium | (noun) a toxic nonmetallic element related to sulfur and tellurium; occurs in several allotropic forms; a stable grey metallike allotrope conducts electricity better in the light than in the dark and is used in photocells; occurs in sulfide ores (as pyrite) | Synonyms: atomic number 34, Se |
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| sensorium | (noun) the areas of the brain that process and register incoming sensory information and make possible the conscious awareness of the world | - |
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| septum | (noun) (anatomy) a dividing partition between two tissues or cavities | - |
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| (noun) a partition or wall especially in an ovary | - |
| sericterium | (noun) silk-producing gland of insects (especially of a silkworm) or spiders | Synonyms: serictery, silk gland |
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| serum | (noun) an amber, watery fluid, rich in proteins, that separates out when blood coagulates | Synonyms: blood serum |
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| siglum | (noun) a sign, abbreviation, letter, or character standing for words in ancient manuscripts or on coins or medals. | - |
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| simulacrum | (noun) a representation of a person (especially in the form of sculpture) | Synonyms: effigy, image |
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| (noun) an insubstantial or vague semblance | - |
| slum | (noun) a district of a city marked by poverty and inferior living conditions | Synonyms: slum area |
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| (verb) spend time at a lower socio-economic level than one's own, motivated by curiosity or desire for adventure; usage considered condescending and insensitive | - |
| sodium | (noun) a silvery soft waxy metallic element of the alkali metal group; occurs abundantly in natural compounds (especially in salt water); burns with a yellow flame and reacts violently in water; occurs in sea water and in the mineral halite (rock salt) | Synonyms: atomic number 11, Na |
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| solarium | (noun) a room enclosed largely with glass and affording exposure to the sun | Synonyms: sun lounge, sun parlor, sun parlour, sun porch, sunporch, sunroom |
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| sorghum | (noun) made from juice of sweet sorghum | Synonyms: sorghum molasses |
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| (noun) economically important Old World tropical cereal grass | - |
| spathiphyllum | (noun) any of various plants of the genus Spathiphyllum having a white or green spathe and a spike of fragrant flowers and often cultivated as an ornamental | Synonyms: peace lily, spathe flower |
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| spectrum | (noun) a broad range of related objects or values or qualities or ideas or activities | - |
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| (noun) an ordered array of the components of an emission or wave | - |
| speculum | (noun) a medical instrument for dilating a bodily passage or cavity in order to examine the interior | - |
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| (noun) a mirror (especially one made of polished metal) for use in an optical instrument | - |
| sphagnum | (noun) any of various pale or ashy mosses of the genus Sphagnum whose decomposed remains form peat | Synonyms: bog moss, peat moss, sphagnum moss |
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| spiculum | (noun) small pointed structure serving as a skeletal element in various marine and freshwater invertebrates e.g. sponges and corals | Synonyms: spicule |
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| spirillum | (noun) any flagellated aerobic bacteria having a spirally twisted rodlike form | Synonyms: spirilla |
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| (noun) spirally twisted elongate rodlike bacteria usually living in stagnant water | - |
| sporangium | (noun) organ containing or producing spores | Synonyms: spore case, spore sac |
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| sputum | (noun) expectorated matter; saliva mixed with discharges from the respiratory passages; in ancient and medieval physiology it was believed to cause sluggishness | Synonyms: phlegm |
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| stadium | (noun) a large structure for open-air sports or entertainments | Synonyms: arena, bowl, sports stadium |
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| sternum | (noun) the flat bone that articulates with the clavicles and the first seven pairs of ribs | Synonyms: breastbone |
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| stratum | (noun) an abstract place usually conceived as having depth | Synonyms: layer, level |
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| (noun) a subpopulation divided into a stratified sampling | - |
| (noun) people having the same social, economic, or educational status | Synonyms: class, social class, socio-economic class |
| (noun) one of several parallel layers of material arranged one on top of another (such as a layer of tissue or cells in an organism or a layer of sedimentary rock) | - |
| striatum | (noun) a striped mass of white and grey matter located in front of the thalamus in each cerebral hemisphere; consists of the caudate nucleus and the lenticular nucleus | Synonyms: corpus striatum, striate body |
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| strontium | (noun) a soft silver-white or yellowish metallic element of the alkali metal group; turns yellow in air; occurs in celestite and strontianite | Synonyms: atomic number 38, Sr |
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| strum | (noun) sound of strumming | - |
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| (verb) sound the strings of (a stringed instrument) | Synonyms: thrum |
| stumblebum | (noun) an awkward stupid person | Synonyms: clod, gawk, goon, lout, lubber, lummox, lump, oaf |
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| (noun) a second-rate prize fighter | Synonyms: palooka |
| stylopodium | (noun) an enlargement at the base of the style in some Umbelliferae | - |
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| subphylum | (noun) (biology) a taxonomic group ranking between a phylum and a class | - |
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| substratum | (noun) an indigenous language that contributes features to the language of an invading people who impose their language on the indigenous population | Synonyms: substrate |
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| (noun) any stratum or layer lying underneath another | Synonyms: substrate |
| (noun) a surface on which an organism grows or is attached | Synonyms: substrate |
| succedaneum | (noun) (medicine) something that can be used as a substitute (especially any medicine that may be taken in place of another) | - |
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| sudatorium | (noun) a bathhouse for hot air baths or steam baths | Synonyms: sudatory |
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| sugarplum | (noun) any of various small sugary candies | - |
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| sum | (noun) the whole amount | Synonyms: aggregate, total, totality |
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| (noun) the choicest or most essential or most vital part of some idea or experience | Synonyms: center, centre, core, essence, gist, heart, heart and soul, inwardness, kernel, marrow, meat, nitty-gritty, nub, pith, substance |
| (noun) a quantity obtained by the addition of a group of numbers | Synonyms: amount, total |
| (noun) the final aggregate | Synonyms: sum total, summation |
| (noun) a set containing all and only the members of two or more given sets | Synonyms: join, union |
| (noun) a quantity of money | Synonyms: amount, amount of money, sum of money |
| (verb) determine the sum of | Synonyms: add, add together, add up, sum up, summate, tally, tot, tot up, total, tote up |
| (verb) be a summary of | Synonyms: sum up, summarise, summarize |
| supercilium | (noun) the arch of hair above each eye | Synonyms: brow, eyebrow |
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| superphylum | (noun) (biology) a taxonomic group ranking between a phylum and below a class or subclass | - |
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| superstratum | (noun) the language of a later invading people that is imposed on an indigenous population and contributes features to their language | Synonyms: superstrate |
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| (noun) any stratum or layer superimposed on another | Synonyms: superstrate |
| syconium | (noun) the fleshy multiple fruit of the fig consisting of an enlarged hollow receptacle containing numerous fruitlets | - |
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| symposium | (noun) a meeting or conference for the public discussion of some topic especially one in which the participants form an audience and make presentations | - |
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| syncytium | (noun) a mass of cytoplasm containing several nuclei and enclosed in a membrane but no internal cell boundaries (as in muscle fibers) | - |
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| synovium | (noun) a thin membrane in synovial (freely moving) joints that lines the joint capsule and secretes synovial fluid | Synonyms: synovial membrane |
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| talcum | (noun) a toilet powder made of purified talc and usually scented; absorbs excess moisture | Synonyms: talcum powder |
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| (noun) a fine grained mineral having a soft soapy feel and consisting of hydrated magnesium silicate; used in a variety of products including talcum powder | Synonyms: talc |
| tantalum | (noun) a hard grey lustrous metallic element that is highly resistant to corrosion; occurs in niobite and fergusonite and tantalite | Synonyms: atomic number 73, Ta |
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| tantrum | (noun) a display of bad temper | Synonyms: conniption, fit, scene |
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| technetium | (noun) a crystalline metallic element not found in nature; occurs as one of the fission products of uranium | Synonyms: atomic number 43, Tc |
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| tedium | (noun) dullness owing to length or slowness | Synonyms: tediousness, tiresomeness |
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| (noun) the feeling of being bored by something tedious | Synonyms: boredom, ennui |
| teetotum | (noun) a conical child's plaything tapering to a steel point on which it can be made to spin | Synonyms: spinning top, top, whirligig |
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