altostratus

noun al·to·stra·tus \ˌal-tō-ˈstrā-təs, -ˈstra-\

plural al·to·stra·ti\-ˌtī\

Definition of ALTOSTRATUS

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

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

First Known Use: 1890

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