| prosperous | (adjective) marked by peace and prosperity | Synonyms: golden, halcyon |
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| (adjective) presaging or likely to bring good luck or a good outcome | Synonyms: favorable, favourable, golden, lucky |
| (adjective) in fortunate circumstances financially; moderately rich | Synonyms: comfortable, easy, well-fixed, well-heeled, well-off, well-situated, well-to-do |
| (adjective) very lively and profitable | Synonyms: booming, burgeoning, flourishing, palmy, prospering, roaring, thriving |
| prosperously | (adverb) in the manner of prosperous people | - |
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| proterozoic | (adjective) formed in the later of two divisions of the Precambrian era | - |
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| pterodactyl | (noun) extinct flying reptile | - |
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| pteropogon | (noun) southern Australian plant having feathery hairs surrounding the fruit | Synonyms: Pteropogon humboltianum |
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| pterosaur | (noun) an extinct reptile of the Jurassic and Cretaceous having a bird-like beak and membranous wings supported by the very long fourth digit of each forelimb | Synonyms: flying reptile |
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| rhinoceros | (noun) massive powerful herbivorous odd-toed ungulate of southeast Asia and Africa having very thick skin and one or two horns on the snout | Synonyms: rhino |
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| saleroom | (noun) an area where merchandise (such as cars) can be displayed | Synonyms: salesroom, showroom |
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| saliferous | (adjective) containing or yielding salt | - |
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| scleroderma | (noun) an autoimmune disease that affects the blood vessels and connective tissue; fibrous connective tissue is deposited in the skin | Synonyms: dermatosclerosis |
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| sclerometer | (noun) a measuring instrument that measures the hardness of materials by penetrating them with a stylus that has a diamond point | - |
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| scleroprotein | (noun) a simple protein found in horny and cartilaginous tissues and in the lens of the eye | Synonyms: albuminoid |
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| sclerosed | (adjective) relating to or having sclerosis; hardened | Synonyms: sclerotic |
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| sclerosis | (noun) any pathological hardening or thickening of tissue | Synonyms: induration |
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| sclerotic | (adjective) of or relating to the sclera of the eyeball | - |
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| (adjective) relating to or having sclerosis; hardened | Synonyms: sclerosed |
| sclerotinia | (noun) any fungus of the genus Sclerotinia; some causing brown rot diseases in plants | - |
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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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| sclerotomy | (noun) surgical incision of the sclerotic coat of the eye | - |
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| seminiferous | (adjective) bearing or producing seed or semen | - |
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| serologic | (adjective) of or relating to serology | Synonyms: serological |
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| serological | (adjective) of or relating to serology | Synonyms: serologic |
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| serologist | (noun) a medical scientist who specializes in serology | - |
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| serology | (noun) the branch of medical science that deals with serums; especially with blood serums and disease | - |
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| serosa | (noun) a thin membrane lining the closed cavities of the body; has two layers with a space between that is filled with serous fluid | Synonyms: serous membrane |
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| serotine | (noun) common brown bat of Europe | Synonyms: Eptesicus serotinus, European brown bat |
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| serotonin | (noun) a neurotransmitter involved in e.g. sleep and depression and memory | Synonyms: 5-hydroxytryptamine |
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| serous | (adjective) of or producing or containing serum | - |
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| serow | (noun) short-horned dark-coated goat antelope of mountain areas of southern and southeastern Asia | - |
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| sideroblast | (noun) an erythroblast having granules of ferritin | - |
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| siderocyte | (noun) an abnormal red blood cell containing granules of iron not bound in hemoglobin | - |
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| sideropenia | (noun) a deficiency of iron; results from inadequate iron in the diet or from hemorrhage | - |
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| siderophilin | (noun) a globulin in blood plasma that carries iron | Synonyms: beta globulin, transferrin |
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| siderosis | (noun) fibrosis of the lung caused by iron dust; occurs among welders and other metal workers | - |
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| slanderous | (adjective) (used of statements) harmful and often untrue; tending to discredit or malign | Synonyms: calumniatory, calumnious, defamatory, denigrating, denigrative, denigratory, libellous, libelous |
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| slanderously | (adverb) in a false and slanderous and defamatory manner; with slander or calumny | Synonyms: calumniously |
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| slanderousness | (noun) The property of being both untrue and harmful to a reputation. | - |
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| slaughterous | (adjective) accompanied by bloodshed | Synonyms: butcherly, gory, sanguinary, sanguineous |
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| slumberous | (adjective) inclined to or marked by drowsiness | Synonyms: slumbery, slumbrous, somnolent |
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| (adjective) quiet and tranquil | Synonyms: slumbrous |
| snakeroot | (noun) a plant of the genus Sanicula having palmately compound leaves and unisexual flowers in panicled umbels followed by bristly fruit; reputed to have healing powers | Synonyms: sanicle |
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| (noun) any of various North American plants of the genus Liatris having racemes or panicles of small discoid flower heads | Synonyms: blazing star, button snakeroot, gay-feather, gayfeather |
| sombrero | (noun) a straw hat with a tall crown and broad brim; worn in American southwest and in Mexico | - |
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| somniferous | (adjective) sleep inducing | Synonyms: hypnagogic, hypnogogic, somnific, soporiferous, soporific |
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| soporiferous | (adjective) sleep inducing | Synonyms: hypnagogic, hypnogogic, somniferous, somnific, soporific |
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| (adjective) inducing mental lethargy | Synonyms: narcotic, soporific |
| sorcerous | (adjective) possessing or using or characteristic of or appropriate to supernatural powers | Synonyms: charming, magic, magical, witching, wizard, wizardly |
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| spherocyte | (noun) an abnormal spherical red blood cell | - |
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| spheroid | (noun) a shape that is generated by rotating an ellipse around one of its axes | Synonyms: ellipsoid of revolution |
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| spheroidal | (adjective) having the nature or shape of an ellipsoid | Synonyms: ellipsoid, ellipsoidal |
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| spherometer | (noun) a measuring instrument for measuring the curvature of a surface | - |
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| splendiferous | (adjective) having great beauty and splendor | Synonyms: glorious, resplendent, splendid |
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| stateroom | (noun) a guest cabin | - |
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| steroid | (noun) any of several fat-soluble organic compounds having as a basis 17 carbon atoms in four rings; many have important physiological effects | - |
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| (noun) any hormone affecting the development and growth of sex organs | Synonyms: sex hormone, steroid hormone |
| steroidal | (adjective) of or relating to steroid hormones or their effects | - |
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| sterol | (noun) any of a group of natural steroid alcohols derived from plants or animals; they are waxy insoluble substances | Synonyms: steroid alcohol |
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| stilbesterol | (noun) synthetic nonsteroid with the properties of estrogen; formerly used to treat menstrual problems but was found to be associated with vaginal cancers in the daughters of women so treated during pregnancy | Synonyms: DES, diethylstilbesterol |
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| stoloniferous | (adjective) producing stolons | - |
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| stoneroot | (noun) erect perennial strong-scented with serrate pointed leaves and a loose panicle of yellowish flowers; the eastern United States | Synonyms: Collinsonia canadensis, horse balm, horseweed, richweed, stone-root, stone root |
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| storeroom | (noun) a room in which things are stored | Synonyms: storage room, stowage |
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| supererogation | (noun) an effort above and beyond the call of duty | - |
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| supererogatory | (adjective) more than is needed, desired, or required | Synonyms: excess, extra, redundant, spare, superfluous, supernumerary, surplus |
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| superorder | (noun) (biology) a taxonomic group ranking above an order and below a class or subclass | - |
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| superordinate | (adjective) of higher rank or status or value | - |
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| (noun) a word that is more generic than a given word | Synonyms: hypernym, superordinate word |
| (noun) one of greater rank or station or quality | Synonyms: higher-up, superior |
| (verb) place in a superior order or rank | - |
| superordination | (noun) the semantic relation of being superordinate or belonging to a higher rank or class | Synonyms: hypernymy |
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| superoxide | (noun) the univalent anion O2- | Synonyms: superoxide anion |
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| (noun) a metallic oxide containing the univalent anion O2- | - |
| switcheroo | (noun) a sudden unexpected switch | - |
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| telerobotics | (noun) the area of robotics that is concerned with the control of robots from a distance | - |
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| testosterone | (noun) a potent androgenic hormone produced chiefly by the testes; responsible for the development of male secondary sex characteristics | - |
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| tetramerous | (adjective) having or consisting of four similar parts; tetramerous flowers | - |
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| theropod | (noun) any of numerous carnivorous dinosaurs of the Triassic to Cretaceous with short forelimbs that walked or ran on strong hind legs | Synonyms: bird-footed dinosaur, theropod dinosaur |
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| thimerosal | (noun) a light-colored crystalline powder (trade name Merthiolate) used as a surgical antiseptic | Synonyms: Merthiolate, sodium ethylmercurithiosalicylate |
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| thunderous | (adjective) loud enough to cause (temporary) hearing loss | Synonyms: deafening, earsplitting, thundery |
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| (adjective) extremely ominous | - |
| thunderousness | (noun) The state or condition of being very loud, suggestive of thunder; booming loudness. | - |
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| thysanopteron | (noun) an insect of the order Thysanoptera | Synonyms: thysanopter, thysanopterous insect |
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| tocopherol | (noun) a fat-soluble vitamin that is essential for normal reproduction; an important antioxidant that neutralizes free radicals in the body | Synonyms: E, vitamin E |
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| torero | (noun) a matador or one of the supporting team during a bull fight | - |
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| transferor | (noun) (law) someone who conveys a title or property to another | - |
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| treacherous | (adjective) dangerously unstable and unpredictable | Synonyms: unreliable |
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| (adjective) tending to betray; especially having a treacherous character as attributed to the Carthaginians by the Romans | Synonyms: perfidious, punic |
| treacherously | (adverb) in a disloyal and faithless manner | Synonyms: faithlessly, false, traitorously, treasonably |
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| treacherousness | (noun) The characteristic of providing insecure footing or support; of being marked by hidden dangers, hazards, or perils. | - |
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| trichopteron | (noun) caddis fly | Synonyms: trichopteran, trichopterous insect |
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| tuberose | (noun) a tuberous Mexican herb having grasslike leaves and cultivated for its spikes of highly fragrant lily-like waxy white flowers | Synonyms: Polianthes tuberosa |
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| tuberosity | (noun) a protuberance on a bone especially for attachment of a muscle or ligament | Synonyms: eminence, tubercle |
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| tuberous | (adjective) of or relating to or resembling a tuber | - |
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| ulcerous | (adjective) having an ulcer or canker | Synonyms: cankerous, ulcerated |
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| umbelliferous | (adjective) relating to or belonging to plants of the family Umbelliferae | - |
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| ungenerous | (adjective) lacking in magnanimity | Synonyms: meanspirited |
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| (adjective) unwilling to spend (money, time, resources, etc.) | Synonyms: stingy |
| ureterocele | (noun) prolapse of the end of the ureter into the bladder; may obstruct urine flow | - |
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| ureterostenosis | (noun) stenosis of the ureter | - |
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| vaquero | (noun) local names for a cowboy (`vaquero' is used especially in southwestern and central Texas and `buckaroo' is used especially in California) | Synonyms: buckaroo, buckeroo |
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| veronal | (noun) a barbiturate used as a hypnotic | Synonyms: barbital, barbitone, diethylbarbituric acid, diethylmalonylurea |
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| veronica | (noun) any plant of the genus Veronica | Synonyms: speedwell |
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| viceroy | (noun) showy American butterfly resembling the monarch but smaller | Synonyms: Limenitis archippus |
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| (noun) governor of a country or province who rules as the representative of his or her king or sovereign | Synonyms: vicereine |
| viceroyalty | (noun) a district or province governed by a viceroy | - |
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| viceroyship | (noun) the position of viceroy | - |
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| viosterol | (noun) a fat-soluble vitamin that prevents rickets | Synonyms: calciferol, cholecalciferol, D, ergocalciferol, vitamin D |
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| vociferous | (adjective) conspicuously and offensively loud; given to vehement outcry | Synonyms: blatant, clamant, clamorous, strident |
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| vociferously | (adverb) in a vociferous manner | - |
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| xeroderma | (noun) a mild form of ichthyosis characterized by abnormal dryness and roughness of the skin | Synonyms: xerodermia |
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| xerodermia | (noun) a mild form of ichthyosis characterized by abnormal dryness and roughness of the skin | Synonyms: xeroderma |
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| xerographic | (adjective) of or relating to xerography | - |
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| xerography | (noun) forming an image by the action of light on a specially coated charged plate; the latent image is developed with powders that adhere only to electrically charged areas | - |
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| xeroma | (noun) abnormal dryness of the conjunctiva and cornea of the eyes; may be due to a systemic deficiency of vitamin A | Synonyms: conjunctivitis arida, xerophthalmia, xerophthalmus |
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