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cerulean

adjective
🔊/sɪˈruːliən/
🔊/sɪˈruːliən/
 (literary)
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  1. deep blue in colour深蓝色的；蔚蓝色的Topics Colours and Shapesc2
    Oxford Collocations DictionaryCerulean is used with these nouns:
    • blue
    • sky
    See full entry
    Word Originmid 17th cent.: from Latin caeruleus ‘sky blue’, from caelum ‘sky’.