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[sir-oh-strey-tuh s, -strat-uh s] /ˌsɪr oʊˈstreɪ təs, -ˈstræt əs/
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).
Origin of cirrostratus
First recorded in 1795-1805; cirro- + stratus
Related forms
cirrostrative, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for cirrostratus


noun (pl) -ti (-taɪ)
a uniform layer of cloud above about 6000 metres (20 000 feet)
Derived Forms
cirrostrative, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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cirrostratus in Science
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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