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cumulonimbus noun

  /ˌkju.mjə.loʊˈnɪm.bəs/ , /ˌkjuː.mjʊ.ləʊˈnɪm.bəs/
  • (meteorology) A cloud, with a tall structure and a flat base, that is often associated with thunderstorms.
 cúmulo-nimbo
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