tre·pan /trɪˈpæn/
 環鋸,鑽孔機(vt.)用環鋸行手術,誘入圈套,欺騙


 Tre·pan n.
 1. Surg. A crown-saw or cylindrical saw for perforating the skull, turned, when used, like a bit or gimlet. See Trephine.
 2. Mining A kind of broad chisel for sinking shafts.


 Tre·pan, v. t. & i. [imp. & p. p. Trepanned p. pr. & vb. n. Trepanning.]  Surg. To perforate (the skull) with a trepan, so as to remove a portion of the bone, and thus relieve the brain from pressure or irritation; to perform an operation with the trepan.


 Tre·pan, n.
 1. A snare; a trapan.
    Snares and trepans that common life lays in its way.   --South.
 2. a deceiver; a cheat.
    He had been from the beginning a spy and a trepan.   --Macaulay.


 Tre·pan, v. t. To insnare; to trap; to trapan.
    Guards even of a dozen men were silently trepanned from their stations.   --De Quincey.

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 trepan
      n 1: a surgical instrument used to remove sections of bone from
           the skull [syn: trephine]
      2: a drill for cutting circular holes around a center
      v : cut a hole with a trepan, as in surgery
      [also: trepanning, trepanned]