Definition of cumulonimbus in English:

cumulonimbus

noun

Meteorology
  • A cloud forming a towering mass with a flat base at fairly low altitude and often a flat top, as in thunderstorms.

    • ‘A cumulonimbus has drifted over the spires of downtown, where it hangs like a vast gray anvil.’
    • ‘The rising air is associated with a region of low air pressure, towering cumulonimbus clouds and rain.’
    • ‘First, thunderstorms are birthed by cumulonimbus clouds.’
    • ‘The rising air cools and produces towering cumulus and cumulonimbus clouds.’
    • ‘As air rises in a large cumulonimbus or thunderhead cloud condensation occurs and all three forms of water are present.’

Pronunciation:

cumulonimbus

/ˌkyo͞omyəlōˈnimbəs/