| thermoplastic | (adjective) having the property of softening or fusing when heated and of hardening and becoming rigid again when cooled | - |
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| (noun) a material that softens when heated and hardens again when cooled | Synonyms: thermoplastic resin |
| thermoreceptor | (noun) a sensory receptor that responds to heat and cold | - |
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| thermoregulator | (noun) a regulator for automatically regulating temperature by starting or stopping the supply of heat | Synonyms: thermostat |
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| thermos | (noun) vacuum flask that preserves temperature of hot or cold drinks | Synonyms: thermos bottle, thermos flask |
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| thermoset | (adjective) having the property of becoming permanently hard and rigid when heated or cured | Synonyms: thermosetting |
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| thermosetting | (adjective) having the property of becoming permanently hard and rigid when heated or cured | Synonyms: thermoset |
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| thermosphere | (noun) the atmospheric layer between the mesosphere and the exosphere | - |
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| thermostat | (noun) a regulator for automatically regulating temperature by starting or stopping the supply of heat | Synonyms: thermoregulator |
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| (verb) control the temperature with a thermostat | - |
| thermostatic | (adjective) of or relating to a thermostat | - |
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| thermostatically | (adverb) by thermostat; in a thermostatic manner | - |
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| thermostatics | (noun) the aspect of thermodynamics concerned with thermal equilibrium | Synonyms: thermodynamics of equilibrium |
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| thermotherapy | (noun) the use of heat to treat a disease or disorder; heating pads or hot compresses or hot-water bottles are used to promote circulation in peripheral vascular disease or to relax tense muscles | - |
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| thermotropism | (noun) an orienting response to warmth | - |
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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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| thither | (adverb) to or toward that place; away from the speaker | Synonyms: there |
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| tither | (noun) someone who pays tithes | - |
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| together | (adjective) mentally and emotionally stable | - |
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| (adverb) at the same time | - |
| (adverb) with cooperation and interchange | Synonyms: unitedly |
| (adverb) in contact with each other or in proximity | - |
| (adverb) assembled in one place | - |
| (adverb) with a common plan | Synonyms: in concert |
| (adverb) in each other's company | - |
| togetherness | (noun) affectionate closeness | - |
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| tollgatherer | (noun) someone employed to collect tolls | Synonyms: toll agent, toll collector, toll taker, toller, tollkeeper, tollman |
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| uintathere | (noun) a variety of dinocerate | Synonyms: dinoceras |
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| unfeathered | (adjective) having no feathers | Synonyms: featherless |
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| (adjective) not having feathers | - |
| ungathered | (adjective) not brought together in one place | Synonyms: uncollected |
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| untethered | (adjective) not confined or restricted with a tether | - |
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| unweathered | (adjective) not worn by exposure to the weather | - |
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| weather | (adjective) towards the side exposed to wind | Synonyms: upwind |
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| (noun) the atmospheric conditions that comprise the state of the atmosphere in terms of temperature and wind and clouds and precipitation | Synonyms: atmospheric condition, conditions, weather condition |
| (verb) change under the action or influence of the weather | - |
| (verb) cause to slope | - |
| (verb) sail to the windward of | - |
| (verb) face and withstand with courage | Synonyms: brave, brave out, endure |
| weatherboard | (noun) the side toward the wind | Synonyms: weather side, windward side |
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| (noun) a long thin board with one edge thicker than the other; used as siding by lapping one board over the board below | Synonyms: clapboard, weatherboarding |
| weatherboarding | (noun) a long thin board with one edge thicker than the other; used as siding by lapping one board over the board below | Synonyms: clapboard, weatherboard |
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| weathercock | (noun) weathervane with a vane in the form of a rooster | - |
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| weathered | (adjective) worn by exposure to the weather | Synonyms: weather-beaten, weatherworn |
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| weatherglass | (noun) a simple barometer for indicating changes in atmospheric pressure | - |
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| weatherliness | (noun) (of a sailing vessel) the quality of being able to sail close to the wind with little drift to the leeward (even in a stiff wind) | - |
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| weatherly | (adjective) (of a sailing vessel) making very little leeway when close-hauled | - |
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| weatherman | (noun) predicts the weather | Synonyms: weather forecaster |
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| weatherproof | (adjective) able to withstand exposure to weather without damage | - |
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| (verb) make resistant to bad weather | - |
| weatherstrip | (noun) a narrow strip of material to cover the joint of a door or window to exclude the cold | Synonyms: weather strip, weather stripping, weatherstripping |
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| (verb) provide with weatherstripping | - |
| weatherstripping | (noun) a narrow strip of material to cover the joint of a door or window to exclude the cold | Synonyms: weather strip, weather stripping, weatherstrip |
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| weathervane | (noun) mechanical device attached to an elevated structure; rotates freely to show the direction of the wind | Synonyms: vane, weather vane, wind vane |
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| weatherworn | (adjective) worn by exposure to the weather | Synonyms: weather-beaten, weathered |
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| wether | (noun) male sheep especially a castrated one | - |
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| wither | (verb) wither, as with a loss of moisture | Synonyms: shrink, shrivel, shrivel up |
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| (verb) lose freshness, vigor, or vitality | Synonyms: fade |
| withered | (adjective) (used especially of vegetation) having lost all moisture | Synonyms: dried-up, sear, sere, shriveled, shrivelled |
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| (adjective) lean and wrinkled by shrinkage as from age or illness | Synonyms: shriveled, shrivelled, shrunken, wizen, wizened |
| withering | (adjective) wreaking or capable of wreaking complete destruction | Synonyms: annihilating, annihilative, devastating |
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| (adjective) making light of | Synonyms: annihilating, devastating |
| (noun) any weakening or degeneration (especially through lack of use) | Synonyms: atrophy |
| witheringly | (adverb) in a withering manner | - |
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| withers | (noun) the highest part of the back at the base of the neck of various animals especially draft animals | - |
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| woolgather | (verb) have a daydream; indulge in a fantasy | Synonyms: daydream, dream, stargaze |
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| woolgatherer | (noun) someone who indulges in idle or absentminded daydreaming | Synonyms: daydreamer |
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| woolgathering | (adjective) dreamy in mood or nature | Synonyms: dreamy, moony |
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| (noun) an idle indulgence in fantasy | - |
| zither | (noun) a musical stringed instrument with strings stretched over a flat sounding board; it is laid flat and played with a plectrum and with fingers | Synonyms: cither, zithern |
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| zithern | (noun) a musical stringed instrument with strings stretched over a flat sounding board; it is laid flat and played with a plectrum and with fingers | Synonyms: cither, zither |
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