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2 definitions found

From: WordNet (r) 2.0

 cumulonimbi
      See cumulonimbus

From: WordNet (r) 2.0

 cumulonimbus
      n : a dark cloud of great vertical extent charged with
          electricity; associated with thunderstorms [syn: cumulonimbus
          cloud, thundercloud]
      [also: cumulonimbi (pl)]