from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun An extremely dense, vertically developed cumulus with a low dark base and fluffy masses that extend to great heights, usually producing heavy rains, thunderstorms, or hailstorms.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A cloud, with a tall structure and a flat base, that is often associated with
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a dark cloud of great vertical extent charged with electricity; associated with thunderstorms
from Wiktionary, Creative Commons Attribution/Share-Alike License
From Latin cumulus ("amass") + nimbus ("cloud").
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