trepan Trenton • trepanation · · · Info · Definitions · Synonyms · Characters · · trepan · · Text Latin · · Script 6 · · Length Definitions · · · (noun) a surgical instrument used to remove sections of bone from the skull. Synonyms: trephine. · · Noun Definition 1 (noun) a drill for cutting circular holes around a center. · · Noun Definition 2 (verb) cut a hole with a trepan, as in surgery. · · Verb Definition 1 Synonyms · · · trephine · · Synonym 1 Characters · · a latin small letter a U+0061 e latin small letter e U+0065 n latin small letter n U+006E p latin small letter p U+0070 r latin small letter r U+0072 t latin small letter t U+0074