Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A large dark cloud charged with electricity and producing thunder and lightning; a cumulonimbus cloud.
  • n. Something menacing or dreadful: thunderclouds of impending war.

from Wiktionary, Creative Commons Attribution/Share-Alike License

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

from the GNU version of the Collaborative International Dictionary of English

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

from The Century Dictionary and Cyclopedia

  • n. A cloud that produces lightning and thunder.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a dark cloud of great vertical extent charged with electricity; associated with thunderstorms

Etymologies

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