| theophany | (noun) a visible (but not necessarily material) manifestation of a deity to a human person | - |
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| theophylline | (noun) a colorless crystalline alkaloid derived from tea leaves or made synthetically; used in medicine as a bronchial dilator | Synonyms: Elixophyllin, Slo-Bid, Theobid |
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| theorem | (noun) an idea accepted as a demonstrable truth | - |
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| (noun) a proposition deducible from basic postulates | - |
| theoretician | (noun) someone who theorizes (especially in science or art) | Synonyms: idealogue, theoriser, theorist, theorizer |
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| theorisation | (noun) the production or use of theories | Synonyms: theorization |
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| theoriser | (noun) someone who theorizes (especially in science or art) | Synonyms: idealogue, theoretician, theorist, theorizer |
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| theorist | (noun) someone who theorizes (especially in science or art) | Synonyms: idealogue, theoretician, theoriser, theorizer |
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| theorization | (noun) the production or use of theories | Synonyms: theorisation |
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| theorizer | (noun) someone who theorizes (especially in science or art) | Synonyms: idealogue, theoretician, theoriser, theorist |
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| theory | (noun) a well-substantiated explanation of some aspect of the natural world; an organized system of accepted knowledge that applies in a variety of circumstances to explain a specific set of phenomena | - |
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| (noun) a tentative insight into the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena | Synonyms: hypothesis, possibility |
| (noun) a belief that can guide behavior | - |
| theosophism | (noun) belief in theosophy | - |
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| theosophist | (noun) a believer in theosophy | - |
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| theosophy | (noun) a system of belief based on mystical insight into the nature of God and the soul | - |
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| theoterrorism | (noun) terrorism for a religious purpose | - |
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| therapeutic | (noun) a medicine or therapy that cures disease or relieve pain | Synonyms: curative, cure, remedy |
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| therapeutics | (noun) branch of medicine concerned with the treatment of disease | - |
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| therapist | (noun) a person skilled in a particular type of therapy | Synonyms: healer |
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| therapsid | (noun) probably warm-blooded; considered direct ancestor of mammals | Synonyms: protomammal |
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| therapy | (noun) (medicine) the act of caring for someone (as by medication or remedial training etc.) | Synonyms: treatment |
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| there | (noun) a location other than here; that place; location, medial pronoun; demonstrative pronoun, location; quantifier: demonstrative determiner, distal; demonstrative pronoun, location; quantifier: demonstrative determiner, singular, distal | - |
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| theremin | (noun) an electronic musical instrument; melodies can be played by moving the right hand between two rods that serve as antennas to control pitch; the left hand controls phrasing | - |
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| thereness | (noun) the state of being there--not here--in position | - |
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| (noun) real existence | - |
| theridiid | (noun) spider having a comb-like row of bristles on each hind foot | Synonyms: comb-footed spider |
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| therm | (noun) a unit of heat equal to 100,000 British thermal units | - |
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| thermal | (noun) rising current of warm air | - |
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| thermalgesia | (noun) pain caused by heat | - |
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| thermel | (noun) a thermometer that uses thermoelectric current to measure temperature | Synonyms: electric thermometer, thermoelectric thermometer |
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| thermion | (noun) an electrically charged particle (electron or ion) emitted by a substance at a high temperature | - |
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| thermionics | (noun) the branch of electronics dealing with thermionic phenomena (especially thermionic vacuum tubes) | - |
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| thermistor | (noun) a semiconductor device made of materials whose resistance varies as a function of temperature; can be used to compensate for temperature variation in other components of a circuit | Synonyms: thermal resistor |
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| thermoacidophile | (noun) archaebacteria that thrive in strongly acidic environments at high temperatures | - |
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| thermocautery | (noun) cautery (destruction of tissue) by heat | - |
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| thermochemistry | (noun) the branch of chemistry that studies the relation between chemical action and the amount of heat absorbed or generated | - |
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| thermocoagulation | (noun) congealing tissue by heat (as by electric current) | - |
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| thermocompressor | (noun) An injector, ejector, steam ejector, steam injector, eductor-jet pump or thermocompressor is a type of pump. | Synonyms: eductor-jet pump, ejector, injector, steam ejector, steam injector |
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| thermocouple | (noun) a kind of thermometer consisting of two wires of different metals that are joined at both ends; one junction is at the temperature to be measured and the other is held at a fixed lower temperature; the current generated in the circuit is proportional to the temperature difference | Synonyms: thermocouple junction |
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| thermodynamics | (noun) the branch of physics concerned with the conversion of different forms of energy | - |
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| thermoelectricity | (noun) electricity produced by heat (as in a thermocouple) | - |
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| thermogram | (noun) a graphical record produced by a thermograph | - |
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| thermograph | (noun) a thermometer that records temperature variations on a graph as a function of time | Synonyms: thermometrograph |
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| (noun) medical instrument that uses an infrared camera to reveal temperature variations on the surface of the body | - |
| thermography | (noun) diagnostic technique using a thermograph to record the heat produced by different parts of the body; used to study blood flow and to detect tumors | - |
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| thermogravimeter | (noun) a hydrometer that includes a thermometer | Synonyms: thermohydrometer |
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| thermogravimetry | (noun) the measurement of changes in weight as a function of changes in temperature used as a technique of chemically analyzing substances | - |
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| thermohydrometer | (noun) a hydrometer that includes a thermometer | Synonyms: thermogravimeter |
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| thermojunction | (noun) a junction between two dissimilar metals across which a voltage appears | - |
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| thermometer | (noun) measuring instrument for measuring temperature | - |
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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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| thermometry | (noun) the measurement of temperature | - |
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| thermopile | (noun) a kind of thermometer for measuring heat radiation; consists of several thermocouple junctions in series | - |
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| thermoplastic | (noun) a material that softens when heated and hardens again when cooled | Synonyms: thermoplastic resin |
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| 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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| 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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| 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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| thesaurus | (noun) a book containing a classified list of synonyms | Synonyms: synonym finder |
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| thesis | (noun) an unproved statement put forward as a premise in an argument | - |
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| (noun) a treatise advancing a new point of view resulting from research; usually a requirement for an advanced academic degree | Synonyms: dissertation |
| thespian | (noun) a theatrical performer | Synonyms: actor, histrion, player, role player |
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| theta | (noun) the 8th letter of the Greek alphabet | - |
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| theurgy | (noun) white magic performed with the help of beneficent spirits (as formerly practiced by Neoplatonists) | - |
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| (noun) the effect of supernatural or divine intervention in human affairs | - |
| thrombasthenia | (noun) a rare autosomal recessive disease in which the platelets do not produce clots in the normal way and hemorrhage results | - |
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| tithe | (noun) an offering of a tenth part of some personal income | - |
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| (noun) a levy of one tenth of something | - |
| tither | (noun) someone who pays tithes | - |
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| 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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| tritheism | (noun) (Christianity) the heretical belief that the Father and the Son and the Holy Spirit are three separate gods | - |
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| tritheist | (noun) someone (not an orthodox Christian) who believes that the Father and Son and Holy Ghost are three separate gods | - |
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| uintathere | (noun) a variety of dinocerate | Synonyms: dinoceras |
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| underclothes | (noun) undergarment worn next to the skin and under the outer garments | Synonyms: underclothing, underwear |
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| weather | (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 |
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| 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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| 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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| weatherman | (noun) predicts the weather | Synonyms: weather forecaster |
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| 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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| 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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| wether | (noun) male sheep especially a castrated one | - |
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| withe | (noun) band or rope made of twisted twigs or stems | - |
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| (noun) strong flexible twig | Synonyms: withy |
| withering | (noun) any weakening or degeneration (especially through lack of use) | Synonyms: atrophy |
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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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| woolgatherer | (noun) someone who indulges in idle or absentminded daydreaming | Synonyms: daydreamer |
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| woolgathering | (noun) an idle indulgence in fantasy | - |
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| xanthelasma | (noun) xanthoma of the eyelids; occurs chiefly in the elderly | - |
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| xanthemia | (noun) excess carotene in the blood stream; can cause the skin to turn a pale yellow or red color | Synonyms: carotenemia |
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| xeranthemum | (noun) any plant of the genus Xeranthemum native to southern Europe having chaffy or silvery flower heads with purplish tubular flowers | - |
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| 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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