Trepan /(?)/

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

imp. & p. p. Trepanned; p. pr. & vb. n. Trepanning

1. 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. (Surg.)

1. A snare; a trapan.

   Snares and trepans that common life lays in its way.

2. a deceiver; a cheat.

   He had been from the beginning a spy and a trepan.

1. To insnare; to trap; to trapan.

   Guards even of a dozen men were silently trepanned from their stations.