Other forms: cannonballs
A cannonball is the heavy iron ball an old gun fired. Fire a cannonball, a cannonball hit the wall, cannonball into the pool.
It did its damage by weight and speed rather than by exploding, and a solid shot could take out a whole file of men. A cannonball into a pool is the jump made curled up to maximise the splash.
1nouncannonballThe heavy iron ball an old gun fired.
“The old castle wall still has a cannonball stuck in it from a siege.”
cannonball is a shot.
Cannon plus ball, from the round shot fired by a cannon.
From cannon + ball from being a round ball that is fired from a cannon.
Etymology from Wiktionary, CC BY-SA