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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)

tetracoccus
nounVery low (technical/biological term)
/ˌtɛtrəˈkɒkəs/A bacterium typically arranged in groups of four cells.
tetracycline
nounLow
/ˌtet.rəˈsaɪ.kliːn/A broad-spectrum antibiotic effective against many bacteria.
tetrad
nounC2
/ˈtet.ræd/A group or set of four.
tetradactyl
adjectivenounLow
/ˌtɛtrəˈdaktɪl/Having four fingers or toes on each hand or foot.
tetradrachma
nounRare / C2
/ˌtɛtrəˈdrækmə/An ancient Greek silver coin, equivalent to four drachmae, widely used in the Hellenistic world.
tetradymite
nounUltra-low (specialist/technical term)
/tɛˈtradɪmʌɪt/A metallic grey mineral consisting of bismuth tellurium sulfide.
tetraethyl lead
nounLow
/ˌtɛtrəˌiːθaɪl ˈlɛd/A toxic organometallic compound, Pb(C₂H₅)₄, historically added to petrol/gasoline as an anti-knock agent.
tetraethyl pyrophosphate
nounC2
/ˌtɛtrəˌiːθaɪl ˌpaɪrə(ʊ)ˈfɒsfeɪt/A synthetic organophosphate compound used primarily as a potent insecticide and acaricide.
tetraethyllead
nounVery Low
/ˌtɛtrəˌɛθɪlˈlɛd/A toxic organometallic compound, (C₂H₅)₄Pb, formerly used as an antiknock additive in petrol/gasoline.
tetrafluoride
nounC2
/ˌtetrəˈflɔːraɪd/A chemical compound containing four fluorine atoms per molecule.
tetrafluoroethene
nounVery Low
/ˌtetrəˌflʊərəʊˈɛθiːn/A colourless, non-flammable gas with the chemical formula C₂F₄, primarily used as a monomer in the production of polytetrafluoroethylene (PTFE).
tetrafluoroethylene
nounC2
/ˌtɛtrəˌflʊərəʊˈɛθɪliːn/A colourless, flammable, gaseous compound (C₂F₄) used as a monomer in the production of polytetrafluoroethylene (PTFE), the polymer known by the trademark Teflon®.
tetragon
nounC1/C2
/ˈtɛtrəɡ(ə)n/A polygon with four sides and four angles; a quadrilateral.
tetragonal trisoctahedron
nounVery low
/ˌtɛtrəˈɡɒnəl ˌtrɪsɒktəˈhiːdrən/A 24-faced polyhedron in crystallography, belonging to the tetragonal crystal system.
tetragram
nounRare
/ˈtetrəɡram/A word or figure consisting of four letters or characters.
tetragrammaton
nounC2
/ˌtetrəˈɡramətɒn/The four Hebrew letters יהוה (Yod, He, Waw, He), which represent the biblical name of God, considered too sacred to be pronounced.
tetrahedrite
nounC2 (Very Low Frequency / Technical)
/ˌtɛtrəˈhiːdraɪt/A greyish-black mineral consisting of a sulfide of copper, iron, antimony, and arsenic, often forming tetrahedral crystals.
tetrahedron
nounC2
/ˌtet.rəˈhiː.drən/A solid geometric figure with four triangular faces.
tetrahydrate
nounC1/C2
/ˌtetrəˈhaɪdreɪt/A chemical compound containing four molecules of water of crystallization per formula unit.
tetrahydrocannabidinol
nounLow
/ˌtɛtrəˌhaɪdrəʊkəˈnæbɪdɪnɒl/A psychoactive cannabinoid found in cannabis plants, commonly abbreviated as THC.

Showing 2041–2060 of 7190 words.