1. a round solid missile of stone or iron made to be fired from a cannon, but now often applied to a missile of any shape, whether solid or hollow, made for cannon. (copied from Webster 1913's cannon writeup)

  2. A jump into a body of water where you curl up the body into a round ball shape while in the air, which creates a large splash when you hit the water.

  3. A really good song by The Breeders.