trepan
1 of 4verb (1)
tre·pan tri-ˈpan 
trepanned; trepanning
transitive verb
1
: to use a trephine on (the skull)
2
: to remove a disk or cylindrical core (as from metal for testing)
trepanation
ˌtre-pə-ˈnā-shən
noun trepan
2 of 4noun (1)
tre·pan ˈtrē-ˌpan
tri-ˈpan
: a heavy tool used in boring mine shafts
trepan
3 of 4noun (2)
tre·pan tri-ˈpan
1
archaic : trickster
2
archaic : a deceptive device : snare
trepan
4 of 4verb (2)
tre·pan tri-ˈpan
trepanned; trepanning
transitive verb
archaic
: entrap, lure
Word History
Etymology
Verb (1)
Middle English, from trepane trephine
Noun (1)
Middle English trepane trephine, Anglo-French trepan, from Medieval Latin trepanum, from Greek trypanon auger, from trypan to bore
Noun (2)
origin unknown
First Known Use
Verb (1)
15th century, in the meaning defined at sense 1
Noun (1)
circa 1877, in the meaning defined above
Noun (2)
1641, in the meaning defined at sense 1
Verb (2)
circa 1656, in the meaning defined above