tre·phine /ˈtriˌfaɪn/
  有柄的環鋸(vt.)用環鋸行手術
  tre·phine /ˈtrɪˌfaɪn, trɪˈ/ 及物動詞
  環鋸,環鑽
  Tre·phine n.  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.
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  trephine
       n : a surgical instrument used to remove sections of bone from
           the skull [syn: trepan]
       v : operate on with a trephine