burr -
rough projection left on a workpiece after drilling or cutting
burr -
rotary file for smoothing rough edges left on a workpiece
Burr -
United States politician who served as vice president under Jefferson; he mortally wounded his political rival Alexander Hamilton in a duel and fled south (1756-1836)
bit the cutting part of a drill; usually pointed and threaded and is replaceable in a brace or bitstock or drill press; "he looked around for the right size bit"