Trepan

·noun A snare; a trapan.

II. Trepan ·noun a deceiver; a cheat.

III. Trepan ·noun A kind of broad chisel for sinking shafts.

IV. Trepan ·vt To Insnare; to Trap; to Trapan.

V. Trepan ·noun A crown-saw or cylindrical saw for perforating the skull, turned, when used, like a bit or gimlet. ·see Trephine.

VI. Trepan ·vt & ·vi 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.