Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A large dark cloud charged with electricity and producing thunder and lightning; a cumulonimbus cloud.
  • noun Something menacing or dreadful.

from The Century Dictionary.

  • noun A cloud that produces lightning and thunder.

from the GNU version of the Collaborative International Dictionary of English.

  • noun A cloud charged with electricity, and producing lightning and thunder.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun a large, dark cloud, usually a cumulonimbus, charged with electricity and producing thunder and lightning; a stormcloud
  • noun by extension something menacing and brooding

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

Etymologies

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Examples

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