Trepan

tre-pan', n. (Surg.) A cylindrical saw for perforating the skull, turned, when used, like a gimlet, — v.t. [trepanned (-pand'), -pan'ning.] To perforate the skull with a trepan, and take out a piece. [F.; LL. trepanurn, Gr. trupanon, a carpenter's auger, borer, also a surgical instrument, trypan, to bore, trupa, a hole, trepein, to turn, bore: torture.] — Trephine, -fin' or -fen', n. (Surg.) An instrument for trepanning, more modern than the trepan. — v. [trephined (-fend'), -phining.] To perforate with a trephine to trepan. Trepan, tre-pan', To insnare, trap, trapan. — n. A snare trapan. [See Trapan, under Trap, for taking game.] — Trepan'ner, n.