Tre*phine" [A dim. of 1st trepan: cf. F. tr'ephine.] 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.
© Webster 1913.
Tre*phine", v. t. [imp. & p. p. Trephined (?); p. pr. & vb. n. Trephining.]
To perforate with a trephine; to trepan.
© Webster 1913.