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Entry 2 senses · 2 variants Webster, 1913

Trephine

· Tre·phine · IPA /tɹɪˈfaɪn/
01 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,…
  1. 1.
    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.(Surg.)
02 v. t. To perforate with a trephine; to trepan.
imp. & p. p. Trephined; p. pr. & vb. n. Trephining
  1. 1.
    To perforate with a trephine; to trepan.