Definitions of Burnside:

• noun:   United States general in the American Civil War who was defeated by Robert E. Lee at the Battle of Fredericksburg (1824-1881)
• noun:   beard grown down the side of a man's face in front of the ears (especially when the rest of the beard is shaved off)
• name:  A surname (rare: 1 in 25000 families; popularity rank in the U.S.: #3229)