English

Definition of cumulonimbus noun from the Oxford Advanced Learner's Dictionary

 

cumulonimbus

 noun
noun
BrE BrE//ˌkjuːmələʊˈnɪmbəs//
 
; NAmE NAmE//ˌkjuːməloʊˈnɪmbəs//
 
[uncountable] (specialist) Sky
 
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a high mass of thick cloud with a flat base, often seen during thunderstorms See related entries: Sky
See the Oxford Advanced American Dictionary entry: cumulonimbus