Definition of cirrostratus noun from the Oxford Advanced American Dictionary

 

cirrostratus

 noun
noun
NAmE//ˌsɪroʊˈstræt̮əs//
 
, NAmE//ˌsɪroʊˈstreɪt̮əs//
 
, NAmE//ˌsɪroʊˈstreɪtəs//
 
(technology)
 
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a thin layer of fairly flat clouds very high up in the sky
See the Oxford Advanced Learner's Dictionary entry: cirrostratus