Definition of "Burr" :

noun: small bit used in dentistry or surgery

noun: rough projection left on a workpiece after drilling or cutting

noun: rotary file for smoothing rough edges left on a workpiece

noun: 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)

noun: seed vessel having hooks or prickles

verb: remove the burrs from