Meaning of “mushroom cloud” in the English Dictionary

british dictionary

"mushroom cloud" in British English

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mushroom cloudnoun [ C usually singular ]

uk /ˈmʌʃ.ruːm ˌklaʊd/ us /ˈmʌʃ.ruːm ˌklaʊd/

a very large cloud of dust that rises into the air in the shape of a large mushroom, especially after a nuclear explosion:

The mushroom cloud over Hiroshima is a horrific image of war.

(Definition of “mushroom cloud” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)