trepan

tre·pan ¹  (tr-pn)

n.

1. A rock-boring tool used in mining for sinking shafts.

2. Medicine A trephine.

tr.v. tre·panned, tre·pan·ning, tre·pans

1. To bore (a shaft) with a trepan.

2. Medicine To trephine.

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[Middle English trepane, surgical crown saw, from Medieval Latin trepanum, from Greek trpanon, borer, from trpn, to pierce, from trp, hole; see ter-¹ in Indo-European roots.]

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trepa·nation (trp-nshn) n.

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tre·pan ²  (tr-pn) also tra·pan (tr-) Archaic

tr.v. tre·panned also tra·panned, tre·pan·ning also tra·pan·ning, tre·pans also tra·pans

To trap; ensnare.

n.

1. A trickster.

2. A trick or snare.

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[Origin unknown.]

Thesaurus

Noun	1.	trepan - a surgical instrument used to remove sections of bone from the skull trephine surgical instrument - a medical instrument used in surgery
	2.	trepan - a drill for cutting circular holes around a center drill - a tool with a sharp point and cutting edges for making holes in hard materials (usually rotating rapidly or by repeated blows)
Verb	1.	trepan - cut a hole with a trepan, as in surgery surgical operation, surgical procedure, surgical process, surgery, operation - a medical procedure involving an incision with instruments; performed to repair damage or arrest disease in a living body; "they will schedule the operation as soon as an operating room is available"; "he died while undergoing surgery" drill, bore - make a hole, especially with a pointed power or hand tool; "don't drill here, there's a gas pipe"; "drill a hole into the wall"; "drill for oil"; "carpenter bees are boring holes into the wall"