Definition of cumulonimbus in English:

cumulonimbus

Syllabification: cu·mu·lo·nim·bus
Pronunciation: /ˌkyo͞omyəlōˈnimbəs
 
/

noun (plural cumulonimbi /-ˈnimbī, -bē/)

Meteorology
A cloud forming a towering mass with a flat base at fairly low altitude and often a flat top, as in thunderstorms.
More example sentences
  • The rising air cools and produces towering cumulus and cumulonimbus clouds.
  • The rising air is associated with a region of low air pressure, towering cumulonimbus clouds and rain.
  • As air rises in a large cumulonimbus or thunderhead cloud condensation occurs and all three forms of water are present.

Definition of cumulonimbus in:

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Pronunciation: ˈflɪp(ə)nt
adjective
not showing a serious or respectful attitude