[ sir-oh-strey-tuh s, -strat-uh s ]
/ ˌsɪr oʊˈstreɪ təs, -ˈstræt əs /

noun, plural cir·ro·stra·tus.

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

OTHER WORDS FROM cirrostratus

cir·ro·stra·tive, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for cirrostratus

British Dictionary definitions for cirrostratus

/ (ˌsɪrəʊˈstrɑːtəs) /

noun plural -ti (-taɪ)

a uniform layer of cloud above about 6000 metres (20 000 feet)

Derived forms of cirrostratus

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

Science definitions for cirrostratus

[ sîr′ō-strătəs ]

Plural cirrostrati (sîr′ō-strătī′)

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.