| tritanopia | (noun) rare form of dichromacy characterized by a lowered sensitivity to blue light resulting in an inability to distinguish blue and yellow | Synonyms: blue-blindness |
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| tritanopic | (adjective) inability to see the color blue or to distinguish the colors blue and yellow | Synonyms: blue-blind |
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| trite | (adjective) repeated too often; overfamiliar through overuse | Synonyms: banal, commonplace, hackneyed, old-hat, shopworn, stock, threadbare, timeworn, tired, well-worn |
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| tritely | (adverb) in a trite manner | - |
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| triteness | (noun) unoriginality as a result of being dull and hackneyed | Synonyms: staleness |
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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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| tritium | (noun) a radioactive isotope of hydrogen; atoms of tritium have three times the mass of ordinary hydrogen atoms | - |
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| tritoma | (noun) a plant of the genus Kniphofia having long grasslike leaves and tall scapes of red or yellow drooping flowers | Synonyms: flame-flower, flame flower, flameflower, kniphofia |
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| triton | (noun) small usually bright-colored semiaquatic salamanders of North America and Europe and northern Asia | Synonyms: newt |
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| (noun) tropical marine gastropods having beautifully colored spiral shells | - |