Answer:

trepan

Answer	Crossword Clue
TREPAN	Rock-boring tool
TREPAN	Boring tool
TREPAN	Shaft-boring tool

TREPAN	It's a bore
TREPAN	Large boring tool
TREPAN	Drill that cuts circles
TREPAN	Circular drill
TREPAN	Coring tool
TREPAN	Rock-boring drill
TREPAN	Surgical instrument.
TREPAN	Cut a cylindrical piece.

TREPAN	Dissect the skull.
TREPAN	Snare.
TREPAN	Heavy boring tool for sinking shafts.
TREPAN	Boring tool.
TREPAN	Cut a disk out of (sheet metal, etc.)
TREPAN	Rock-boring tool.
TREPAN	Cutting tool
TREPAN	Tool for boring

TREPAN	Surgeon's tool
TREPAN	Mining tool
TREPAN	Boring instrument
TREPAN	Tool used in mining
TREPAN	Brain surgeon's instrument
TREPAN	Mine shaft borer
TREPAN	Mine shaft tool
TREPAN	Mine shaft drill

TREPAN	Machine tool
TREPAN	Mineshaft tool
TREPAN	Heavy boring tool
TREPAN	Tool used in boring mines
TREPAN	Bone-boring tool