cirrostratus
noun/ˌsɪrəʊˈstrɑːtəs/
/ˌsɪrəʊˈstreɪtəs/
(specialist)- a thin layer of fairly flat clouds very high up in the skyWord Origincirro- from Latin cirrus ‘curl, fringe’.
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cirrostratus
Definition of cirrostratus noun from the Oxford Advanced Learner's Dictionary