| 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 |
| 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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| trepidation | (noun) a feeling of alarm or dread | - |
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| treponema | (noun) spirochete that causes disease in humans (e.g. syphilis and yaws) | - |
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