Definition of altostratus in English:

altostratus

noun

  • [mass noun] Cloud forming a continuous uniform layer which resembles stratus but occurs at medium altitude (typically 2 to 7 km, 6,500 to 23,000 ft).

    • ‘You were probably looking at the sun or moon through a layer of altostratus clouds.’
    • ‘Where enough light shows through cirrostratus clouds to create shadows, it does not with altostratus.’
    • ‘From the ground this altostratus looks white or slightly blue and watery.’
    • ‘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.’

Origin

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

Pronunciation:

altostratus

/ˌaltəʊˈstrɑːtəs//ˌaltəʊˈstreɪtəs/