[ sir-oh-strey-tuhs, -strat-uhs ]
/ ˌsɪr oʊˈstreɪ təs, -ˈstræt əs /
Save This Word!

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).
We could talk until we're blue in the face about this quiz on words for the color "blue," but we think you should take the quiz and find out if you're a whiz at these colorful terms.
Question 1 of 8
Which of the following words describes “sky blue”?
Meet Grammar CoachWrite or paste your essay, email, or story into Grammar Coach and get grammar helpImprove Your Writing
Meet Grammar CoachImprove Your Writing
Write or paste your essay, email, or story into Grammar Coach and get grammar help

Origin of cirrostratus

First recorded in 1795–1805; cirro- + stratus

OTHER WORDS FROM cirrostratus

cir·ro·stra·tive, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use cirrostratus in a sentence

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

Scientific 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.