Definition of cannonball
(Entry 1 of 2)
1 : a usually round solid missile made for firing from a cannon
2 : a jump into water made with the arms holding the knees tight against the chest
3 : a hard flat tennis service
4 : an express train
cannonball
verbcannonballed; cannonballing; cannonballs
Definition of cannonball (Entry 2 of 2)
: to travel with great speed
Keep scrolling for more
Keep scrolling for more
Keep scrolling for more
Test Your Vocabulary
Words of Snow and Ice Quiz
- Which of the following refers to thin, bending ice, or to the act of running over such ice?

Test your knowledge - and maybe learn something along the way.
TAKE THE QUIZ
Anagram puzzles meet word search.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridgedWords at Play
Ask the Editors
Word Games
Words of Snow and Ice Quiz
A selection of words from the chillier parts of t...
Take the quizName that Thing: Toys and Games Edition
It's all fun and games until someone beats your h...
Take the quizTrue or False?
Test your knowledge - and maybe learn something a...
Take the quizSCRABBLE® Sprint
SCRABBLE® fans, sharpen your skills!
Play the game
Share cannonball
Time Traveler for cannonball
The first known use of cannonball was in 1606
See more words from the same year