Word Origin & History
trepan (v.)
c.1400, from Fr. trépaner (14c.), from M.L. trepanum "a saw for cutting out small pieces of bone from the skull," from Gk. trypanon, from trypan "to bore," related to trype "hole" (cf. O.C.S. truplu "hollow"), from PIE base *tere- "to rub, turn."