cirrostratus UK /ˌsɪɹə(ʊ)ˈstɹeɪtəs/US /ˌsɪɹoʊˈstɹeɪtəs/ noun1 •A principal high-level cloud type appearing as a whitish veil, usually fibrous but sometimes smooth, which may totally cover the sky and which often produces halo phenomena. formscirrostrati
