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Definition of stratus noun from the Oxford Advanced Learner's Dictionary

 

stratus

 noun
noun
BrE BrE//ˈstreɪtəs//
 
; NAmE NAmE//ˈstreɪtəs//
 
; BrE BrE//ˈstrɑːtəs//
 
; NAmE NAmE//ˈstrɑːtəs//
 
[uncountable] (specialist)
 
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a type of cloud that forms a continuous grey sheet covering the sky Word Origin early 19th cent.: modern Latin, from Latin, literally ‘strewn’, past participle of sternere.
See the Oxford Advanced American Dictionary entry: stratus