Definition of cerulean adjective from the Oxford Advanced Learner's Dictionary

 

cerulean

 adjective
adjective
BrE BrE//sɪˈruːliən//
 
; NAmE NAmE//sɪˈruːliən//
 
(literary)
 
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deep blue in colour Word Origin mid 17th cent.: from Latin caeruleus ‘sky blue’, from caelum ‘sky’.
See the Oxford Advanced American Dictionary entry: cerulean