TREPH'INE, noun [See Trepan.] An instrument for trepanning, more modern than the trepan. It is a circular or cylindrical saw, with a handle like that of a gimblet, and a little sharp perforator, called the center-pin. TREPH'INE, verb transitive To perforate with a trephine; to trepan.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI