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cirrus

noun
🔊/ˈsɪrəs/
🔊/ˈsɪrəs/
 [uncountable] (specialist)
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  1. a type of light cloud that forms high in the sky卷云Topics Weatherc2
    Oxford Collocations DictionaryCirrus is used before these nouns:
    • cloud
    See full entry
    Word Originearly 18th cent. (in the sense ‘tendril’): from Latin, literally ‘a curl’.