Trephine :: Trephine (n.) 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..

Trephine :: Trephine (v. t.) To perforate with a trephine; to trepan.

Trephined :: Trephined (imp. & p. p.) of Trephin.

Trephining :: Trephining (p. pr. & vb. n.) of Trephin.

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