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



BrE BrE//ˈsɪrəs//
; NAmE NAmE//ˈsɪrəs//
[uncountable](specialist) Sky
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a type of light cloud that forms high in the sky See related entries: Sky Word Origin early 18th cent. (in the sense ‘tendril’): from Latin, literally ‘a curl’.
See the Oxford Advanced American Dictionary entry: cirrus