Dictionarycan•non•ballPronunciation: (kan'un-bôl"), [key] —n. Also,can'non ball". 1. a missile, usually round and made of iron or steel, designed to be fired from a cannon. 2. Tennis.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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