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Meaning of cannonball

can•non•ball

Pronunciation: (kan'un-bôl"), [key]
— n.
  1. a missile, usually round and made of iron or steel, designed to be fired from a cannon.
  2. a served ball that travels with great speed and describes little or no arc in flight.
  3. anything that moves with great speed, as an express train.
—adj.
  1. made from a curled-up position with the arms pressing the knees against one's chest: a cannonball dive.
  2. moving at great speed: a train known as a cannonball express.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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