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

cumulonimbus

noun

/ˌkjuːmələʊˈnɪmbəs/

/ˌkjuːmələʊˈnɪmbəs/

[uncountable] (specialist)

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a high mass of thick cloud with a flat base, often seen during thunderstormsTopics Weatherc2
Oxford Collocations Dictionary
Cumulonimbus is used before these nouns:
cloud
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See cumulonimbus in the Oxford Advanced American Dictionary

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noun

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B2

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