altostratus

noun
al·​to·​stra·​tus | \ˌal-tō-ˈstrā-təs, -ˈstra- \
plural altostrati\-​ˌtī \

Definition of altostratus 

: a fairly uniform mid-altitude layer of gray cloud darker than cirrostratus — see cloud illustration

First Known Use of altostratus

1890, in the meaning defined above

History and Etymology for altostratus

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

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The first known use of altostratus was in 1890

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