cir·​ro·​stra·​tus | \ ˌsir-ō-ˈstrā-təs How to pronounce cirrostratus (audio) , -ˈstra- How to pronounce cirrostratus (audio) \

Definition of cirrostratus

: a fairly uniform high thin cloud layer darker than cirrus and often covering the entire sky — see cloud illustration

Examples of cirrostratus in a Sentence

Recent Examples on the Web High clouds are classified as either cirrus, cirrostratus, or cirrocumulus. Catherine Zuckerman, National Geographic, "Clouds, explained," 24 Apr. 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'cirrostratus.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of cirrostratus

circa 1803, in the meaning defined above

History and Etymology for cirrostratus

New Latin

Keep scrolling for more

Learn More about cirrostratus

Time Traveler for cirrostratus

Time Traveler

The first known use of cirrostratus was circa 1803

See more words from the same year

Statistics for cirrostratus

Cite this Entry

“Cirrostratus.” Dictionary, Merriam-Webster, Accessed 7 Aug. 2020.

More from Merriam-Webster on cirrostratus

Rhyming Dictionary: Words that rhyme with cirrostratus Encyclopedia article about cirrostratus

Comments on cirrostratus

What made you want to look up cirrostratus? Please tell us where you read or heard it (including the quote, if possible).


Test Your Vocabulary

Original Meanings Quiz

  • rembrandt painting a young scholar and his tutor
  • Which of the following is the earliest known sense of the word awe?
Spell It

Can you spell these 10 commonly misspelled words?


Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!