al·​to·​stra·​tus ˌal-tō-ˈstrā-təs How to pronounce altostratus (audio) -ˈstra- How to pronounce altostratus (audio)
plural altostrati ˌal-tō-ˈstrā-ˌtī How to pronounce altostratus (audio)
: a fairly uniform mid-altitude layer of gray cloud darker than cirrostratus see cloud illustration

Examples of altostratus in a Sentence

Recent Examples on the Web Mid-level clouds are usually gray and are identified as either altocumulus, altostratus, or nimbostratus. Catherine Zuckerman, National Geographic, 24 Apr. 2019

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'altostratus.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


New Latin, from Latin altus + New Latin -o- + stratus

First Known Use

1890, in the meaning defined above

Time Traveler
The first known use of altostratus was in 1890

Dictionary Entries Near altostratus

Cite this Entry

“Altostratus.” Dictionary, Merriam-Webster, Accessed 16 Jul. 2024.

Kids Definition


al·​to·​stra·​tus ˌal-tō-ˈstrāt-əs How to pronounce altostratus (audio) -ˈstrat- How to pronounce altostratus (audio)
: a layer of gray cloud similar to cirrostratus but darker and at a lower level

More from Merriam-Webster on altostratus

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