Tre-phīne' or Tre-phïne'1, n.
(Synop., § 130), n. [Diminutive of trepan, q. v.; Fr. tréphine.] (Surg.) An instrument for trepanning, more modern than the trepan. It is a circular or cylindrical saw, with a handle like that of a gimlet, and a little sharp perforator called the center-pin.