Definition of cumulonimbus
: cumulus cloud having a low base and often spread out in the shape of an anvil extending to great heights — see cloud illustration
Test Your Vocabulary
Commonly Confused Words Quiz
-
- I went to the ______ store to buy a birthday card.

Test your knowledge - and maybe learn something along the way.
TAKE THE QUIZ
A daily challenge for crossword fanatics.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridged
Share cumulonimbus
Time Traveler for cumulonimbus
The first known use of cumulonimbus was in 1887
See more words from the same year