altostratus /ˌaltəʊˈstrɑːtəs, ˌaltəʊˈstreɪtəs/

a

I. noun [ mass noun]

1. 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).
– origin late 19th cent.: from modern Latin alto- (from Latin altus ‘high’) + stratus.

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