altostratus[al′tō strāt′əs, -strat′-]
the type of gray or bluish cloud found at intermediate altitudes and consisting of a thick, dense, extensive layer of ice crystals and water droplets: may cause light precipitation
Origin of altostratusalto- + stratus
An extended cloud formation of bluish or gray sheets or layers.
Origin of altostratusLatin altus, high; see al-2 in Indo-European roots + stratus.