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English Words Starting With T

7,190 entries — pick a word to see its definition, pronunciation, and usage.

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Noun Verb Adjective Adverb Plural noun Combining form Verb (transitive)Verb (intransitive)Verb (ambitransitive)

thermoplastic
adjectivenounC1
/ˌθɜː.məʊˈplæs.tɪk/A type of polymer that becomes soft and moldable when heated and solidifies upon cooling, capable of being reshaped multiple times.
thermopylae
nounC1/C2
/θəˈmɒpɪliː/A narrow coastal pass in central Greece, famous as the site of a heroic defensive battle in 480 BC during the Greco-Persian Wars, where a vastly outnumbered Greek force, led by King Leonidas of Sparta, held off the massive Persian army of Xerxes I for three days.
thermoreceptor
nounC2
/ˌθɜː.məʊ.rɪˈsep.tə(r)/A sensory nerve cell or organ that responds to changes in temperature.
thermoregulation
nounLow
/ˌθɜː.məʊ.ˌreɡ.jʊˈleɪ.ʃən/The physiological process by which an organism maintains a stable internal body temperature despite changes in the external environment.
thermos
nounB1
/ˈθɜː.mɒs/A brand name that has become generic for a double-walled container used to keep liquids hot or cold.
thermoscope
nounC1/C2
/ˈθɜː.məˌskəʊp/A device that indicates a change in temperature without providing a precise numerical measurement.
thermosiphon
nounLow
/ˌθɜːməʊˈsaɪfən/A system for circulating fluid without a mechanical pump, using natural convection driven by temperature differences.
thermosphere
nounLow frequency (specialized term)
/ˈθɜː.mə.sfɪə/The layer of the Earth's atmosphere located above the mesosphere, characterized by a rapid increase in temperature with height, extending from about 85 km to the edge of space.
thermostat
nounverb-transitiveB2
/ˈθɜː.mə.stæt/A device that automatically regulates temperature by switching a heating or cooling system on and off.
thermostatics
nounC2
/ˌθɜː.məʊˈstæt.ɪks/The branch of physics dealing with systems in thermal equilibrium, focusing on the relationships between temperature, heat, and energy without considering time-dependent processes.
thermotaxis
nounC2 / Very Low Frequency
/ˌθɜːməʊˈtæksɪs/The movement of an organism or cell toward or away from a source of heat.
thermotherapy
nounC1/C2
/ˌθɜː.məʊˈθer.ə.pi/A medical treatment involving the application of heat.
thermotropism
nounVery Low
/θɜːˈmɒtrəpɪzəm/The directional growth or movement of an organism, or part of an organism, in response to a temperature stimulus.
theron
nounVery Low
/ˈθɛr.ɒn/A proper noun, primarily a surname or given name.
therophyte
nounRare
/ˈθɪərə(ʊ)ˌfʌɪt/A plant that survives an unfavorable season as a seed, completing its life cycle in a single growing season.
theropod
nounLow
/ˈθɪərəpɒd/A carnivorous dinosaur that walked on two legs.
theroux
nounLow
/θəˈruː/A surname of French origin, commonly associated with the American travel writer Paul Theroux.
thersites
nounVery low
/θəːˈsʌɪtiːz/A person who is a habitual, bitter, and foul-mouthed complainer or critic; a mean-spirited railer.
thesaurismosis
nounVery Rare / Technical
/θɪˌsɔːrɪzˈməʊsɪs/A pathological condition resulting from the excessive accumulation or storage of a substance in the body, often minerals or metabolic products.
thesaurus
nounC1
/θɪˈsɔːrəs/A reference work that lists words grouped together according to similarity of meaning, typically containing synonyms and sometimes antonyms.

Showing 2461–2480 of 7190 words.