Also found in: Idioms.
Burr(bûr), Aaron 1756-1836.
American politician who became vice president of the United States (1801-1805) under Thomas Jefferson after a deadlock in the electoral college was broken by the House of Representatives. In 1804, Burr mortally wounded his rival Alexander Hamilton in a duel. He later became involved in a conspiracy to establish an independent nation in Mexico and the Southwest and was tried for treason but acquitted.