| sundial | (noun) timepiece that indicates the daylight hours by the shadow that the gnomon casts on a calibrated dial | - |
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| sundog | (noun) a bright spot on the parhelic circle; caused by diffraction by ice crystals | Synonyms: mock sun, parhelion |
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| sundown | (noun) the time in the evening at which the sun begins to fall below the horizon | Synonyms: sunset |
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| sundowner | (noun) a drink taken at sundown | - |
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| (noun) a tramp who habitually arrives at sundown | - |
| sundress | (noun) a light loose sleeveless summer dress with a wide neckline and thin shoulder straps that expose the arms and shoulders | - |
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| sundries | (noun) miscellaneous objects too numerous or too small to be specified | - |
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| sundrops | (noun) a day-flowering biennial or perennial of the genus Oenothera | Synonyms: Oenothera fruticosa |
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| sunfish | (noun) small carnivorous freshwater percoid fishes of North America usually having a laterally compressed body and metallic luster: crappies, black bass, bluegills, pumpkinseed | Synonyms: centrarchid |
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| (noun) among the largest bony fish; pelagic fish having an oval compressed body with high dorsal and anal fins and caudal fin reduced to a rudder-like lobe; worldwide in warm waters | Synonyms: headfish, mola, ocean sunfish |
| (noun) the lean flesh of any of numerous American perch-like fishes of the family Centrarchidae | - |
| sunflower | (noun) any plant of the genus Helianthus having large flower heads with dark disk florets and showy yellow rays | Synonyms: helianthus |
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| sunglass | (noun) a convex lens that focuses the rays of the sun; used to start a fire | - |
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| sunglasses | (noun) (plural) spectacles that are darkened or polarized to protect the eyes from the glare of the sun | Synonyms: dark glasses, shades |
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| sunhat | (noun) a hat with a broad brim that protects the face from direct exposure to the sun | Synonyms: sun hat |
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| sunlamp | (noun) a mercury-vapor lamp used in medical or cosmetic treatments | Synonyms: sun-ray lamp, sun lamp, sunray lamp |
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| sunlight | (noun) the rays of the sun | Synonyms: sun, sunshine |
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| sunniness | (noun) lightness created by sunlight | - |
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| (noun) the quality of being cheerful and dispelling gloom | Synonyms: cheer, cheerfulness, sunshine |
| sunporch | (noun) a room enclosed largely with glass and affording exposure to the sun | Synonyms: solarium, sun lounge, sun parlor, sun parlour, sun porch, sunroom |
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| sunray | (noun) a ray of sunlight | Synonyms: sunbeam |
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| (noun) a ray of artificial ultraviolet light from a sunray lamp | Synonyms: sun-ray |
| (noun) herb having a basal cluster of grey-green leaves and leafless stalks each with a solitary broad yellow flower head; desert areas Idaho to Arizona | Synonyms: Enceliopsis nudicaulis |
| sunrise | (noun) the daily event of the sun rising above the horizon | - |
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| (noun) atmospheric phenomena accompanying the daily appearance of the sun | - |
| (noun) the first light of day | Synonyms: aurora, break of day, break of the day, cockcrow, dawn, dawning, daybreak, dayspring, first light, morning, sunup |
| sunroof | (noun) an automobile roof having a sliding or raisable panel | Synonyms: sunshine-roof |
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| sunroom | (noun) a room enclosed largely with glass and affording exposure to the sun | Synonyms: solarium, sun lounge, sun parlor, sun parlour, sun porch, sunporch |
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| sunrose | (noun) any plant of the genus Helianthemum; vigorous plants of stony alpine meadows and dry scrub regions | Synonyms: helianthemum, sun rose |
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| sunscreen | (noun) a cream spread on the skin; contains a chemical (as PABA) to filter out ultraviolet light and so protect from sunburn | Synonyms: sun blocker, sunblock |
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| sunset | (noun) the daily event of the sun sinking below the horizon | - |
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| (noun) atmospheric phenomena accompanying the daily disappearance of the sun | - |
| (noun) the time in the evening at which the sun begins to fall below the horizon | Synonyms: sundown |
| sunshade | (noun) a canopy made of canvas to shelter people or things from rain or sun | Synonyms: awning, sunblind |
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| (noun) a handheld collapsible source of shade | Synonyms: parasol |
| sunshine | (noun) the quality of being cheerful and dispelling gloom | Synonyms: cheer, cheerfulness, sunniness |
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| (noun) the rays of the sun | Synonyms: sun, sunlight |
| (noun) moderate weather; suitable for outdoor activities | Synonyms: fair weather, temperateness |
| sunspot | (noun) a cooler darker spot appearing periodically on the sun's photosphere; associated with a strong magnetic field | Synonyms: macula |
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| sunstone | (noun) a translucent quartz spangled with bits of mica or other minerals | Synonyms: aventurine |
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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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| sunsuit | (noun) a child's garment consisting of a brief top and shorts | - |
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| suntan | (noun) a browning of the skin resulting from exposure to the rays of the sun | Synonyms: tan |
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| suntrap | (noun) a terrace or garden oriented to take advantage of the sun while protected from cold winds | Synonyms: solar trap |
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| sunup | (noun) the first light of day | Synonyms: aurora, break of day, break of the day, cockcrow, dawn, dawning, daybreak, dayspring, first light, morning, sunrise |
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| superabundance | (noun) a quantity that is more than what is appropriate | Synonyms: overabundance, overmuch, overmuchness |
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| superfecundation | (noun) fertilization of two or more ova released during the same menstrual cycle by sperm from separate acts of coitus (especially by different males) | - |
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| surmounter | (noun) someone who overcomes and establishes ascendancy and control by force or persuasion | Synonyms: overcomer, subduer |
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| surround | (noun) the area in which something exists or lives | Synonyms: environment, environs, surroundings |
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| surroundings | (noun) the area in which something exists or lives | Synonyms: environment, environs, surround |
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| (noun) the environmental condition | Synonyms: milieu |
| tabun | (noun) the first known nerve agent, synthesized by German chemists in 1936; a highly toxic combustible liquid that is soluble in organic solvents and is used as a nerve gas in chemical warfare | Synonyms: GA |
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| taunt | (noun) aggravation by deriding or mocking or criticizing | Synonyms: taunting, twit |
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| taunting | (noun) aggravation by deriding or mocking or criticizing | Synonyms: taunt, twit |
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| telecommunication | (noun) (often plural) the branch of electrical engineering concerned with the technology of electronic communication at a distance | - |
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| (noun) (often plural) systems used in transmitting messages over a distance electronically | Synonyms: telecom |
| tenpounder | (noun) game fish resembling the tarpon but smaller | Synonyms: Elops saurus, ladyfish |
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| thermojunction | (noun) a junction between two dissimilar metals across which a voltage appears | - |
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| thunder | (noun) street names for heroin | Synonyms: big H, hell dust, nose drops, scag, skag, smack |
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| (noun) a deep prolonged loud noise | Synonyms: boom, roar, roaring |
| (noun) a booming or crashing noise caused by air expanding along the path of a bolt of lightning | - |
| thunderbird | (noun) (mythology) the spirit of thunder and lightning believed by some Native Americans to take the shape of a great bird | - |
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| thunderbolt | (noun) a shocking surprise | Synonyms: bombshell, thunderclap |
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| (noun) a discharge of lightning accompanied by thunder | Synonyms: bolt, bolt of lightning |
| thunderclap | (noun) a single sharp crash of thunder | - |
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| (noun) a shocking surprise | Synonyms: bombshell, thunderbolt |
| thundercloud | (noun) a dark cloud of great vertical extent charged with electricity; associated with thunderstorms | Synonyms: cumulonimbus, cumulonimbus cloud |
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| thunderer | (noun) a noisemaker that makes a sound like thunder | - |
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| thunderhead | (noun) a rounded projecting mass of a cumulus cloud with shining edges; often appears before a thunderstorm | - |
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| thunderousness | (noun) The state or condition of being very loud, suggestive of thunder; booming loudness. | - |
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| thundershower | (noun) a short rainstorm accompanied by thunder and lightning | - |
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| thunderstorm | (noun) a storm resulting from strong rising air currents; heavy rain or hail along with thunder and lightning | Synonyms: electric storm, electrical storm |
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| thunk | (noun) a dull hollow sound | - |
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| tribunal | (noun) an assembly (including one or more judges) to conduct judicial business | Synonyms: court, judicature |
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| tribune | (noun) the apse of a Christian church that contains the bishop's throne | - |
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| (noun) (ancient Rome) an official elected by the plebeians to protect their interests | - |
| tribuneship | (noun) the position of tribune | - |
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| trouncing | (noun) the act of inflicting corporal punishment with repeated blows | Synonyms: beating, drubbing, lacing, licking, thrashing, whacking |
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| (noun) a sound defeat | Synonyms: debacle, drubbing, slaughter, thrashing, walloping, whipping |
| truncation | (noun) the act of cutting short | - |
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| (noun) the replacement of an edge or solid angle (as in cutting a gemstone) by a plane (especially by a plane that is equally inclined to the adjacent faces) | - |
| (noun) the property of being truncated or short | Synonyms: shortness |
| truncheon | (noun) a short stout club used primarily by policemen | Synonyms: baton, billy, billy club, billystick, nightstick |
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| trundle | (noun) small wheel or roller | - |
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| (noun) a low bed to be slid under a higher bed | Synonyms: truckle, truckle bed, trundle bed |
| trunk | (noun) a long flexible snout as of an elephant | Synonyms: proboscis |
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| (noun) luggage consisting of a large strong case used when traveling or for storage | - |
| (noun) compartment in an automobile that carries luggage or shopping or tools | Synonyms: automobile trunk, boot, luggage compartment |
| (noun) the body excluding the head and neck and limbs | Synonyms: body, torso |
| (noun) the main stem of a tree; usually covered with bark; the bole is usually the part that is commercially useful for lumber | Synonyms: bole, tree trunk |
| trunkfish | (noun) any of numerous small tropical fishes having body and head encased in bony plates | Synonyms: boxfish |
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| trunks | (noun) (used in the plural) trousers that end at or above the knee | Synonyms: short pants, shorts |
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| trunnel | (noun) a wooden peg that is used to fasten timbers in shipbuilding; water causes the peg to swell and hold the timbers fast | Synonyms: treenail, trenail |
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| tsunami | (noun) a cataclysm resulting from a destructive sea wave caused by an earthquake or volcanic eruption | - |
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| tsundere | (noun) a person who is initially cold and even hostile towards another person before gradually showing a warmer side over time. | - |
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| (noun) a character development process that describes a person who is initially cold and even hostile towards another person before gradually showing a warmer side over time. | - |
| tudung | (noun) a scarf worn around the head by Muslim women in Malaysia; conceals the hair but not the face | - |
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| tun | (noun) a large cask especially one holding a volume equivalent to 2 butts or 252 gals | - |
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| tuna | (noun) any very large marine food and game fish of the genus Thunnus; related to mackerel; chiefly of warm waters | Synonyms: tunny |
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| (noun) New Zealand eel | Synonyms: Anguilla sucklandii |
| (noun) important warm-water fatty fish of the genus Thunnus of the family Scombridae; usually served as steaks | Synonyms: tuna fish, tunny |
| (noun) tropical American prickly pear of Jamaica | Synonyms: Opuntia tuna |
| tunaburger | (noun) a sandwich that resembles a hamburger but made with tuna instead of beef | - |
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| tundra | (noun) a vast treeless plain in the Arctic regions where the subsoil is permanently frozen | - |
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| tune | (noun) the adjustment of a radio receiver or other circuit to a required frequency | - |
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| (noun) the property of producing accurately a note of a given pitch | - |
| (noun) a succession of notes forming a distinctive sequence | Synonyms: air, line, melodic line, melodic phrase, melody, strain |
| tunefulness | (noun) the property of having a melody | Synonyms: melodiousness |
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| tuner | (noun) an electronic receiver that detects and demodulates and amplifies transmitted signals | Synonyms: radio, radio receiver, radio set, receiving set, wireless |
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| (noun) someone who tunes a musical instrument | - |
| tung | (noun) Chinese tree bearing seeds that yield tung oil | Synonyms: Aleurites fordii, tung-oil tree, tung tree |
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| tungstate | (noun) a salt of tungstic acid | - |
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| tungsten | (noun) a heavy grey-white metallic element; the pure form is used mainly in electrical applications; it is found in several ores including wolframite and scheelite | Synonyms: atomic number 74, W, wolfram |
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| tunic | (noun) any of a variety of loose fitting cloaks extending to the hips or knees | - |
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| (noun) an enveloping or covering membrane or layer of body tissue | Synonyms: adventitia, tunica |
| tunica | (noun) an enveloping or covering membrane or layer of body tissue | Synonyms: adventitia, tunic |
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| tunicate | (noun) primitive marine animal having a saclike unsegmented body and a urochord that is conspicuous in the larva | Synonyms: urochord, urochordate |
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| tuning | (noun) (music) calibrating something (an instrument or electronic circuit) to a standard frequency | - |
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| tunnage | (noun) a tax imposed on ships that enter the US; based on the tonnage of the ship | Synonyms: tonnage, tonnage duty |
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| tunnel | (noun) a passageway through or under something, usually underground (especially one for trains or cars) | - |
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| (noun) a hole made by an animal, usually for shelter | Synonyms: burrow |
| tunny | (noun) any very large marine food and game fish of the genus Thunnus; related to mackerel; chiefly of warm waters | Synonyms: tuna |
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| (noun) important warm-water fatty fish of the genus Thunnus of the family Scombridae; usually served as steaks | Synonyms: tuna, tuna fish |
| turnaround | (noun) turning in the opposite direction | Synonyms: reversal, reverse, reversion, turnabout |
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| (noun) act or process of unloading and loading and servicing a vessel or aircraft for a return trip | Synonyms: turnround |
| (noun) an area sufficiently large for a vehicle to turn around | - |
| (noun) a decision to reverse an earlier decision | Synonyms: change of mind, flip-flop, reversal, turnabout |
| (noun) time need to prepare a vessel or ship for a return trip | Synonyms: turnaround time |
| turnround | (noun) act or process of unloading and loading and servicing a vessel or aircraft for a return trip | Synonyms: turnaround |
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| ultrasound | (noun) using the reflections of high-frequency sound waves to construct an image of a body organ (a sonogram); commonly used to observe fetal growth or study bodily organs | Synonyms: echography, sonography, ultrasonography |
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| (noun) very high frequency sound; used in ultrasonography | - |
| unabridged | (noun) a dictionary that has not been shortened by the omitting terms or definitions; a comprehensive dictionary | Synonyms: unabridged dictionary |
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| unacceptability | (noun) unsatisfactoriness by virtue of not conforming to approved standards | Synonyms: unacceptableness |
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| unacceptableness | (noun) unsatisfactoriness by virtue of not conforming to approved standards | Synonyms: unacceptability |
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| unadaptability | (noun) the inability to change or be changed to fit changed circumstances | - |
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| unaffectedness | (noun) not affected; a personal manner that is not consciously constrained | - |
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| unai | (noun) relatively small fast-moving sloth with two long claws on each front foot | Synonyms: Choloepus didactylus, two-toed sloth, unau |
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| (noun) a sloth of Central America that has two long claws on each forefoot and three long claws on each hindfoot | Synonyms: Choloepus hoffmanni, two-toed sloth, unau |
| unalterability | (noun) the quality of not being alterable | - |
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| (noun) the quality of being fixed and unchangeable | Synonyms: fixedness |
| unambiguity | (noun) clarity achieved by the avoidance of ambiguity | Synonyms: unequivocalness |
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| unanimity | (noun) everyone being of one mind | - |
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| unappetisingness | (noun) the property of spoiling the appetite | Synonyms: unappetizingness |
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| unappetizingness | (noun) the property of spoiling the appetite | Synonyms: unappetisingness |
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| unapproachability | (noun) a disposition to be unapproachable; unfriendly and inaccessible | - |
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