burr (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).
burr (Noun) — Seed vessel having hooks or prickles.
burr (Noun) — Rough projection left on a workpiece after drilling or cutting.
burr (Noun) — Rotary file for smoothing rough edges left on a workpiece.
burr (Noun) — Small bit used in dentistry or surgery.
burr (Verb) — Remove the burrs from.