— cirrostrative , adj.
/sir'oh stray"teuhs, -strat"euhs/ , n. , pl. cirrostratus .
a cloud of a class characterized by a composition of ice crystals and often by the production of halo phenomena and appearing as a whitish and usually somewhat fibrous veil, often covering the whole sky and sometimes so thin as to be hardly discernible: of high altitude, ab. 20,000-40,000 ft. (6000-12,000 m).
[ 1795-1805; CIRRO- + STRATUS ]