trepan (1), trepane

[Fr. trépan =a trepan, from Low Lat. trepanum (for trypanum ), from Gr. trypan on a carpenter's tool, an auger, a trepan; trypo to bore; tryp a, trype =a hole.] *1. Mil .: A war engine or instrument used in sieges for piercing or making holes in the walls of besieged towns. "The Inginers have the trepan dre ed." T. Hudson: Judith , iii. 107. 2. Surg.: A crown saw used principally in removing portions of the skull. The trephine is an improved form. [TREPHINE.] "I began to work with the trepan , which I much prefer before a trephine." - Wiseman: Surgery , bk. v., ch. ix. 3. A workman's name for the steel at the foot of a boring-rod. Also spelt trepang . trě-păn' (2), *tra-pan', s. [O. Fr. trappan a snare, a trap for animals, from trappe = a trap (q. v.).] 1. A snare, a trap, a trick. "In th' interim spare for no trepans To draw her neck into the banns." Butler: Hudibras, III. iii. 2. A cheat, a deceiver, a trickster. 2. Brush - making : The operation or proce of drawing the tufts or bristles into the holes in the stock by means of wire inserted through holes in the edge, which are then plugged, concealing the mode of operation. trepanning-elevator, s. Surg.: A lever for raising the portion of bone detached by the trephine. *trepeget, s . [TREBUCHET.]