One of the mysteries of the English language finally explained.
Cloud forming a continuous uniform layer that resembles stratus but occurs at medium altitude, usually 6,500–23,000 feet (2–7 km).
- ‘The grey layer looks like and should be an altostratus although the fronts look different in the tropical regions.’
- ‘Where enough light shows through cirrostratus clouds to create shadows, it does not with altostratus.’
- ‘An altostratus cloud usually covers the whole sky and has a gray or blue-gray appearance.’
- ‘You were probably looking at the sun or moon through a layer of altostratus clouds.’
- ‘From the ground this altostratus looks white or slightly blue and watery.’
Late 19th century: from modern Latin alto- (from Latin altus ‘high’) + stratus.
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