cannonball

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cannonball

1. Tennis
a. a very fast low serve
b. (as modifier): a cannonball serve
2. a jump into water by a person who has his arms tucked into the body to form a ball
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

cannonball

[′kan·ən‚bȯl]
(ordnance)
A missile that is spheroidal in shape and fired from a cannon.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.