| trepan | (noun) a drill for cutting circular holes around a center | - |
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| (noun) a surgical instrument used to remove sections of bone from the skull | Synonyms: trephine |
| (verb) cut a hole with a trepan, as in surgery | - |
| trepang | (noun) of warm coasts from Australia to Asia; used as food especially by Chinese | Synonyms: Holothuria edulis |
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| trephination | (noun) an operation that removes a circular section of bone from the skull | - |
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| trephine | (noun) a surgical instrument used to remove sections of bone from the skull | Synonyms: trepan |
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| (verb) operate on with a trephine | - |
| trepid | (adjective) timid by nature or revealing timidity | Synonyms: fearful, timorous |
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| trepidation | (noun) a feeling of alarm or dread | - |
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| trepidly | (adverb) in a timorous and trepid manner | Synonyms: timorously |
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| treponema | (noun) spirochete that causes disease in humans (e.g. syphilis and yaws) | - |
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