cumulus Hear it!

cumulus definition

cu·mu·lus (kyo̵̅o̅′myə ləs)

noun pl. cumuli -·li′ (-lī′)

  1. a heap; mass; pile
  2. the type of bright, billowy cloud with a dark, flat base, that develops vertically through all cloud levels and consists mostly of water droplets

Etymology: L, a heap < IE *u-melos, a swelling, increase < base *eu-, a swelling > cave

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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