Trepan

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.
v. t. & i.	1.	(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. [imp. & p. p. Trepanned ; p. pr. & vb. n. Trepanning.]
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.
v. t.	1.	To insnare; to trap; to trapan. Guards even of a dozen men were silently trepanned from their stations. - De Quincey.

Noun	1.	trepan - a surgical instrument used to remove sections of bone from the skull Synonyms: trephine
	2.	trepan - a drill for cutting circular holes around a center
Verb	1.	trepan - cut a hole with a trepan, as in surgery

bore, drill, operation, surgery, surgical operation, surgical procedure, surgical process, trephine

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