noun Also, cannon ball.
a missile, usually round and made of iron or steel, designed to be fired from a cannon.
Tennis. a served ball that travels with great speed and describes little or no arc in flight.
anything that moves with great speed, as an express train.
made from a curled-up position with the arms pressing the knees against one's chest: a cannonball dive.
moving at great speed: a train known as a cannonball express.

1655–65; cannon + ball1 Unabridged


Julian ("Cannonball") 1928–75, American jazz saxophonist. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To cannonball
World English Dictionary
cannonball (ˈkænənˌbɔːl)
1.  a projectile fired from a cannon: usually a solid round metal shot
2.  tennis
 a.  a very fast low serve
 b.  (as modifier): a cannonball serve
3.  a jump into water by a person who has his arms tucked into the body to form a ball
vb (often foll by along, etc)
4.  to rush along, like a cannonball
5.  to execute a cannonball jump
6.  very fast or powerful

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
The crew had to sponge out the inside of the barrel, pack a gunpowder charge, and load a cannonball.
Some species, including the mushroom and cannonball jellyfish, are even considered a delicacy by humans.
Leatherbacks are frequently seen feeding on cannonball jellyfish that are abundant at that time of year.
No, to be correct a cannonball is inert and does not contain explosives.
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