| retrospect | (noun) contemplation of things past | - |
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| retrospection | (noun) memory for experiences that are past | - |
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| (noun) reference to things past | - |
| retrospective | (noun) an exhibition of a representative selection of an artist's life work | - |
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| retroversion | (noun) returning to a former state | Synonyms: regress, regression, retrogression, reversion |
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| (noun) translation back into the original language | - |
| (noun) a turning or tilting backward of an organ or body part | Synonyms: retroflection, retroflexion |
| retrovirus | (noun) any of a group of viruses that contain two single-strand linear RNA molecules per virion and reverse transcriptase (RNA to DNA); the virus transcribes its RNA into a cDNA provirus that is then incorporated into the host cell | - |
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| retrovision | (noun) a vision of events in the distant past | - |
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| semitropics | (noun) regions adjacent to the tropics | Synonyms: subtropics |
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| sidestroke | (noun) a swimming stroke in which the arms move forward and backward while the legs do a scissors kick | - |
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| somatotrophin | (noun) a hormone produced by the anterior pituitary gland; promotes growth in humans | Synonyms: growth hormone, human growth hormone, somatotrophic hormone, somatotropic hormone, somatotropin, STH |
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| somatotropin | (noun) a hormone produced by the anterior pituitary gland; promotes growth in humans | Synonyms: growth hormone, human growth hormone, somatotrophic hormone, somatotrophin, somatotropic hormone, STH |
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| spectrogram | (noun) a photographic record of a spectrum | Synonyms: spectrograph |
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| spectrograph | (noun) a spectroscope by which spectra can be photographed | - |
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| (noun) a photographic record of a spectrum | Synonyms: spectrogram |
| spectrometer | (noun) spectroscope for obtaining a mass spectrum by deflecting ions into a thin slit and measuring the ion current with an electrometer | Synonyms: mass spectrometer |
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| spectrometry | (noun) the use of spectroscopes to analyze spectra | Synonyms: spectrographic analysis, spectroscopic analysis, spectroscopy, spectrum analysis |
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| spectrophotometer | (noun) a photometer for comparing two light radiations wavelength by wavelength | - |
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| spectroscope | (noun) an optical instrument for spectrographic analysis | Synonyms: prism spectroscope |
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| spectroscopy | (noun) the use of spectroscopes to analyze spectra | Synonyms: spectrographic analysis, spectrometry, spectroscopic analysis, spectrum analysis |
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| stabilitron | (noun) a semiconductor diode that exhibits a sharp increase in reverse current at a well-defined reverse voltage: used as a voltage regulator | Synonyms: zenerdiode |
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| stilbestrol | (noun) a potent estrogen used in medicine and in feed for livestock and poultry | Synonyms: DES, diethylstilbestrol, diethylstilboestrol, stilboestrol |
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| stilboestrol | (noun) a potent estrogen used in medicine and in feed for livestock and poultry | Synonyms: DES, diethylstilbestrol, diethylstilboestrol, stilbestrol |
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| strobe | (noun) scientific instrument that provides a flashing light synchronized with the periodic movement of an object; can make moving object appear stationary | Synonyms: strobe light, stroboscope |
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| strobile | (noun) cone-shaped mass of ovule- or spore-bearing scales or bracts | Synonyms: cone, strobilus |
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| strobilus | (noun) cone-shaped mass of ovule- or spore-bearing scales or bracts | Synonyms: cone, strobile |
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| stroboscope | (noun) scientific instrument that provides a flashing light synchronized with the periodic movement of an object; can make moving object appear stationary | Synonyms: strobe, strobe light |
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| stroke | (noun) (sports) the act of swinging or striking at a ball with a club or racket or bat or cue or hand | Synonyms: shot |
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| (noun) a light touch with the hands | Synonyms: stroking |
| (noun) a single complete movement | - |
| (noun) any one of the repeated movements of the limbs and body used for locomotion in swimming or rowing | - |
| (noun) a punctuation mark (/) used to separate related items of information | Synonyms: diagonal, separatrix, slash, solidus, virgule |
| (noun) a mark made on a surface by a pen, pencil, or paintbrush | - |
| (noun) the maximum movement available to a pivoted or reciprocating piece by a cam | Synonyms: cam stroke, throw |
| (noun) a light touch | - |
| (noun) anything that happens suddenly or by chance without an apparent cause | Synonyms: accident, chance event, fortuity |
| (noun) the oarsman nearest the stern of the shell who sets the pace for the rest of the crew | - |
| (noun) (golf) the unit of scoring in golf is the act of hitting the ball with a club | - |
| (noun) a sudden loss of consciousness resulting when the rupture or occlusion of a blood vessel leads to oxygen lack in the brain | Synonyms: apoplexy, cerebrovascular accident, CVA |
| stroking | (noun) a light touch with the hands | Synonyms: stroke |
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| stroll | (noun) a leisurely walk (usually in some public place) | Synonyms: amble, perambulation, promenade, saunter |
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| stroller | (noun) a small vehicle with four wheels in which a baby or child is pushed around | Synonyms: baby buggy, baby carriage, carriage, go-cart, perambulator, pram, pushchair, pusher |
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| (noun) someone who walks at a leisurely pace | Synonyms: ambler, saunterer |
| stroma | (noun) the supporting tissue of an organ (as opposed to parenchyma) | - |
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| (noun) the dense colorless framework of a chloroplast | - |
| (noun) a mass of fungal tissue that has spore-bearing structures embedded in it or on it | - |
| stromateid | (noun) small marine fish with a short compressed body and feeble spines | Synonyms: butterfish, stromateid fish |
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| strongbox | (noun) a strongly made box for holding money or valuables; can be locked | Synonyms: deedbox |
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| stronghold | (noun) a strongly fortified defensive structure | Synonyms: fastness |
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| strongman | (noun) a powerful political figure who rules by the exercise of force or violence | - |
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| (noun) a man who performs feats of strength at a fair or circus | - |
| strongroom | (noun) a burglarproof and fireproof room in which valuables are kept | - |
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| strontianite | (noun) a mineral consisting of strontium carbonate | - |
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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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| strop | (noun) a leather strap used to sharpen razors | - |
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| strophanthin | (noun) a bitter and very toxic glycoside derived from plants of the genus Strophanthus; in moderate doses it is a cardiac stimulant but in larger doses it is a powerful poison; used in Africa as an arrow poison | - |
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| strophanthus | (noun) any of various shrubs or small trees of the genus Strophanthus having whorled leaves and showy flowers of various colors in dense and corymbose clusters; some have poisonous seeds | - |
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| strophe | (noun) one section of a lyric poem or choral ode in classical Greek drama | - |
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| subtropics | (noun) regions adjacent to the tropics | Synonyms: semitropics |
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| sunstroke | (noun) sudden prostration due to exposure to the sun or excessive heat | Synonyms: insolation, siriasis, thermic fever |
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| synchrocyclotron | (noun) cyclotron that achieves relativistic velocities by modulating the frequency of the accelerating electric field | - |
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| synchrotron | (noun) cyclotron in which the electric field is maintained at a constant frequency | - |
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| tetrode | (noun) a thermionic tube having four electrodes | - |
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| tetrodotoxin | (noun) a powerful neurotoxin found in the ovaries of pufferfish | - |
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| tetrose | (noun) any monosaccharide sugar containing four atoms of carbon per molecule | - |
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| tetroxide | (noun) an oxide containing four atoms of oxygen in the molecule | - |
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| theatrology | (noun) the study of theatrical performance in relation to its literary, physical, psycho-biological, sociological, and historical contexts. | Synonyms: theatre studies |
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| thermometrograph | (noun) a thermometer that records temperature variations on a graph as a function of time | Synonyms: thermograph |
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| thermotropism | (noun) an orienting response to warmth | - |
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| thyrotrophin | (noun) anterior pituitary hormone that stimulates the function of the thyroid gland | Synonyms: thyroid-stimulating hormone, thyrotrophic hormone, thyrotropic hormone, thyrotropin, TSH |
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| thyrotropin | (noun) anterior pituitary hormone that stimulates the function of the thyroid gland | Synonyms: thyroid-stimulating hormone, thyrotrophic hormone, thyrotrophin, thyrotropic hormone, TSH |
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| tightrope | (noun) tightly stretched rope or wire on which acrobats perform high above the ground | - |
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| trinitroglycerin | (noun) a heavy yellow poisonous oily explosive liquid obtained by nitrating glycerol; used in making explosives and medically as a vasodilator (trade names Nitrospan and Nitrostat) | Synonyms: glyceryl trinitrate, nitroglycerin, nitroglycerine, Nitrospan, Nitrostat |
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| trinitrotoluene | (noun) explosive consisting of a yellow crystalline compound that is a flammable toxic derivative of toluene | Synonyms: TNT |
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| trochanter | (noun) one of the bony prominences developed near the upper extremity of the femur to which muscles are attached | - |
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| troche | (noun) a medicated lozenge used to soothe the throat | Synonyms: cough drop, pastil, pastille |
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| trochee | (noun) a metrical unit with stressed-unstressed syllables | - |
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| trochlear | (noun) either of the two cranial nerves on either side that control the superior oblique muscles of the eyes | Synonyms: fourth cranial nerve, trochlear nerve, trochlearis |
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| trochlearis | (noun) either of the two cranial nerves on either side that control the superior oblique muscles of the eyes | Synonyms: fourth cranial nerve, trochlear, trochlear nerve |
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| troglodyte | (noun) someone who lives in a cave | Synonyms: cave dweller, cave man, caveman |
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| (noun) one who lives in solitude | Synonyms: hermit, recluse, solitary, solitudinarian |
| trogon | (noun) forest bird of warm regions of the New World having brilliant lustrous plumage and long tails | - |
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| troika | (noun) a Russian carriage pulled by three horses abreast | - |
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| (noun) a modern Russian triumvirate | - |
| (noun) the cardinal number that is the sum of one and one and one | Synonyms: 3, deuce-ace, III, leash, tercet, ternary, ternion, terzetto, three, threesome, tierce, trey, triad, trine, trinity, trio, triplet |
| trojan | (noun) a program that appears desirable but actually contains something harmful | Synonyms: trojan horse |
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| trojniak | (noun) a Polish mead, made using two units of water for each unit of honey. | - |
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| troll | (noun) angling by drawing a baited line through the water | Synonyms: trolling |
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| (noun) a fisherman's lure that is used in trolling | - |
| (noun) a partsong in which voices follow each other; one voice starts and others join in one after another until all are singing different parts of the song at the same time | Synonyms: round |
| (noun) (Scandinavian folklore) a supernatural creature (either a dwarf or a giant) that is supposed to live in caves or in the mountains | - |
| troller | (noun) a fisherman who uses a hook and line | Synonyms: angler |
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| trolley | (noun) a wheeled vehicle that runs on rails and is propelled by electricity | Synonyms: streetcar, tram, tramcar, trolley car |
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| trolleybus | (noun) a passenger bus with an electric motor that draws power from overhead wires | Synonyms: trackless trolley, trolley coach |
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| trolling | (noun) angling by drawing a baited line through the water | Synonyms: troll |
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| trollop | (noun) a woman adulterer | Synonyms: adulteress, fornicatress, hussy, jade, loose woman, slut, strumpet |
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| (noun) a dirty untidy woman | Synonyms: slattern, slovenly woman, slut |
| (noun) A sexually loose woman | Synonyms: ho, hoe, hussy, slut |
| trombiculiasis | (noun) infestation with chiggers | - |
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| trombiculid | (noun) mite that as nymph and adult feeds on early stages of small arthropods but whose larvae are parasitic on terrestrial vertebrates | - |
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| trombidiid | (noun) mite that in all stages feeds on other arthropods | - |
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| trombone | (noun) a brass instrument consisting of a long tube whose length can be varied by a U-shaped slide | - |
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| trombonist | (noun) a musician who plays the trombone | Synonyms: trombone player |
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| trompillo | (noun) weedy nightshade with silvery foliage and violet or blue or white flowers; roundish berry widely used to curdle milk; central United States to South America | Synonyms: prairie berry, purple nightshade, silver-leaved nettle, silver-leaved nightshade, silverleaf nightshade, Solanum elaeagnifolium, white horse nettle |
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| troop | (noun) a group of soldiers | - |
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| (noun) an orderly crowd | Synonyms: flock |
| (noun) a unit of Girl or Boy Scouts | Synonyms: scout group, scout troop |
| (noun) a cavalry unit corresponding to an infantry company | - |
| trooper | (noun) a mounted police officer | - |
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| (noun) a soldier in a motorized army unit | Synonyms: cavalryman |
| (noun) a state police officer | Synonyms: state trooper |
| (noun) a soldier mounted on horseback | Synonyms: cavalryman |
| troops | (noun) soldiers collectively | Synonyms: military personnel, soldiery |
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| troopship | (noun) ship for transporting troops | - |
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| trope | (noun) language used in a figurative or nonliteral sense | Synonyms: figure, figure of speech, image |
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| trophobiosis | (noun) a symbiotic relation in which one organism protects the other in return for some kind of food product | - |
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| trophoblast | (noun) the membrane that forms the wall of the blastocyst in early development; aids implantation in the uterine wall | - |
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| trophotropism | (noun) an orienting response to food | - |
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| trophozoite | (noun) a sporozoan in the active feeding stage of its life cycle | - |
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| trophy | (noun) something given as a token of victory | Synonyms: prize |
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| (noun) an award for success in war or hunting | - |
| tropic | (noun) either of two parallels of latitude about 23.5 degrees to the north and south of the equator representing the points farthest north and south at which the sun can shine directly overhead and constituting the boundaries of the Torrid Zone or tropics | - |
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| tropicbird | (noun) mostly white web-footed tropical seabird often found far from land | Synonyms: boatswain bird, tropic bird |
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| tropics | (noun) the part of the Earth's surface between the Tropic of Cancer and the Tropic of Capricorn; characterized by a hot climate | Synonyms: Torrid Zone, tropical zone |
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| tropism | (noun) an involuntary orienting response; positive or negative reaction to a stimulus source | - |
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| troponomy | (noun) the place names of a region or a language considered collectively | Synonyms: troponymy |
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| troponym | (noun) a word that denotes a manner of doing something | Synonyms: manner name |
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| troponymy | (noun) the place names of a region or a language considered collectively | Synonyms: troponomy |
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| (noun) the semantic relation of being a manner of does something | - |
| tropopause | (noun) the region of discontinuity between the troposphere and the stratosphere | - |
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| troposphere | (noun) the lowest atmospheric layer; from 4 to 11 miles high (depending on latitude) | - |
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| trot | (noun) a slow pace of running | Synonyms: jog, lope |
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| (noun) a gait faster than a walk; diagonally opposite legs strike the ground together | - |
| (noun) a literal translation used in studying a foreign language (often used illicitly) | Synonyms: crib, pony |
| troth | (noun) a solemn pledge of fidelity | Synonyms: plight |
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| (noun) a mutual promise to marry | Synonyms: betrothal, engagement |
| trotline | (noun) a long fishing line with many shorter lines and hooks attached to it (usually suspended between buoys) | Synonyms: setline, spiller, trawl, trawl line |
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