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cumulus

noun
🔊/ˈkjuːmjələs/
🔊/ˈkjuːmjələs/
 [uncountable] (specialist)
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  1. a type of thick white cloud积云Topics Weatherc2
    Oxford Collocations DictionaryCumulus is used before these nouns:
    • cloud
    See full entry
    Word Originmid 17th cent. (denoting a heap or an accumulation): from Latin, ‘heap’.