Tre*phine" (?; 277), n. [A dim. of 1st trepan: cf. F. tréphine.] (Surg.) An instrument for trepanning, being an improvement on 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.

Tre*phine", v. t. [imp. & p. p. Trephined (?); p. pr. & vb. n. Trephining.] To perforate with a trephine; to trepan.

Tre*phine" (?; 277), n. [A dim. of 1st trepan: cf. F. tréphine.] (Surg.) An instrument for trepanning, being an improvement on 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.

Tre*phine", v. t. [imp. & p. p. Trephined (?); p. pr. & vb. n. Trephining.] To perforate with a trephine; to trepan.