Definition of altostratus in English:

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Pronunciation: /ˌaltōˈstrātəs/ Pronunciation: /-ˈstratəs/


Cloud forming a continuous uniform layer that resembles stratus but occurs at medium altitude, usually 6,500–23,000 feet (2-7 km).
Example sentences
  • The grey layer looks like and should be an altostratus although the fronts look different in the tropical regions.
  • An altostratus cloud usually covers the whole sky and has a gray or blue-gray appearance.
  • Where enough light shows through cirrostratus clouds to create shadows, it does not with altostratus.


Late 19th century: from modern Latin alto- (from Latin altus 'high') + stratus.

Words that rhyme with altostratus

cirrostratus, nimbostratus, stratus

For editors and proofreaders

Syllabification: al·to·stra·tus

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