[sir-oh-strey-tuhs, -strat-uhs]
noun, plural 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, about 20,000–40,000 feet (6000–12,000 meters).

1795–1805; cirro- + stratus

cirrostrative, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cirrostratus (ˌsɪrəʊˈstrɑːtəs)
n , pl -ti
a uniform layer of cloud above about 6000 metres (20 000 feet)

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
cirrostratus   (sîr'ō-strāt'əs)  Pronunciation Key 
Plural cirrostrati (sîr'ō-strāt'ī')
A thin, hazy, high-altitude cloud composed of ice crystals, often covering the sky in sheets and producing a halo effect around the sun. Cirrostratus clouds generally form between 6,100 and 12,200 m (20,000 and 40,000 ft). See illustration at cloud.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The bottoms of cirrostratus clouds are illuminated at sunset.
Sun dogs are the result of ice crystal clouds called cirrostratus clouds refracting or reflecting light from the sun.
Cirrostratus clouds often produce a halo around the sun or moon.
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