Definition of cumulonimbus noun from the Oxford Advanced American Dictionary

 

cumulonimbus

 noun
noun
NAmE//ˌkyumyəloʊˈnɪmbəs//
 
[uncountable](technology)
 
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a high mass of thick cloud with a flat base, often seen during thunderstorms
See the Oxford Advanced Learner's Dictionary entry: cumulonimbus