- an early form of the trephine
- a heavy boring tool for sinking shafts, quarrying, etc.
Origin of trepanMiddle English trepane from Medieval Latin trepanum from Classical Greek trypanon, carpenters' tool, auger, trepan from trypan, to bore from Indo-European an unverified form treup- from base an unverified form ter-, to bore, rub from source throw
transitive verb-·panned′, -·pan′ning
- to cut a disk out of (a metal plate, ingot, etc.)