1. cumulonimbus

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


  • cloud
  • cumulonimbus cloud


  • clear up
  • brighten
  • reality

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Sentences with cumulonimbus

1. Noun, singular or mass
As an example, rain-bearing cumulonimbus clouds often begin at below 6,000 feet and extend upward to altitudes above 20,000 feet.

2. Adjective
A cumulus cloud becomes a cumulonimbus cloud capable of severe thunderstorms when sufficient heat, updraft and moisture combine in the cloud to produce lightning, thunder and heavy rains.