Origin: ME trepane < ML trepanum < Gr trypanon, carpenters' tool, auger, trepan < trypan, to bore < IE *treup- < base *ter-, to bore, rub > throw
See trepan in American Heritage Dictionary 4
Origin: Middle English trepane, surgical crown saw
Origin: , from Medieval Latin trepanum
Origin: , from Greek trūpanon, borer
Origin: , from trūpān, to pierce
Origin: , from trūpē, hole; see terə-1 in Indo-European roots.
transitive verb tre·panned also tra·panned, tre·pan·ning also tra·pan·ning, tre·pans also tra·pans
Origin: Origin unknown.
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