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cirrostratus

[sir-oh-strey-tuh s, -strat-uh s]
noun, plural cir·ro·stra·tus.
  1. 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).
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Origin of cirrostratus

First recorded in 1795–1805; cirro- + stratus
Related formscir·ro·stra·tive, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for cirrostratus

cirrostratus

noun plural -ti (-taɪ)
  1. a uniform layer of cloud above about 6000 metres (20 000 feet)
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Derived Formscirrostrative, 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

cirrostratus in Science

cirrostratus

[sîr′ō-strătəs]
Plural cirrostrati (sîr′ō-strătī′)
  1. 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.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.