Cumulonimbus (noun)
kyu-mu-lo-nim-bus
A cumulus cloud of great vertical extent, the top often forming an anvil shape and the bottom being dark coloured, indicating rain or hail: associated with thunderstorms
First recorded in 1885–90.
Example sentences
“We’re hiding out indoors today, the Cumulonimbus clouds have piled up and we’re being treated to a lightning show.”
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