What does "cannonball" mean?

A spherical projectile fired from a smoothbore cannon.

What is a synonym for "cannonball"?

Common synonyms include: round shot, antelope, arrow, backflop, ball, ball.

Pronounced //ˈkænənˌbɔːl//.

//ˈkænənˌbɔːl// noun, verb, slang

noun, verb, slang ·Common ·High school level

Noun

1
A spherical projectile fired from a smoothbore cannon.
2
a solid projectile that in former times was fired from a cannon wordnet
3
An explosive-filled hollow iron sphere fused through a hole and intended to explode at a calculated distance rather than explode on impact.
4
The act of jumping (typically into a swimming pool) with the legs bent and the arms wrapped around the knees to create a large splash, mimicking the flight and shape of a cannonball.
"The New Yorker, 30 August 2004, p.40"
5
Something that moves fast, especially a fast train. figuratively, slang
"Meetings of the model train club always begin with the song "Wabash Cannonball"."

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6
A served ball that travels with great speed and describes little or no arc in flight.

Verb

1
To jump or dive into water, performing a cannonball landing. intransitive
"He cannonballed into the pool, drenching us all."
2
To career; to move rapidly. intransitive
"The car cannonballed past."