Tre*pan", v. t. & i. [imp. & p. p. Trepanned (?); p. pr. & vb. n.
Trepanning.] [Cf. F. trépaner. See Trepan a saw.] (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. [See Trapan.] 1. A snare; a trapan.
Snares and trepans that common life lays in its way.
South.