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tre·pan1  audio  (tr-pn) KEY 

NOUN:
  1. A rock-boring tool used in mining for sinking shafts.
  2. Medicine A trephine.
TRANSITIVE VERB:
tre·panned, tre·pan·ning, tre·pans
  1. To bore (a shaft) with a trepan.
  2. Medicine To trephine.

ETYMOLOGY:
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

OTHER FORMS:
trepa·nation  (trp-nshn) KEY (Noun)


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