altocumulus cloud definition
noun, plural altocumulus. Meteorology. 1. a cloud of a class characterized by globular masses or rolls in layers or patches, the individual elements being larger and darker than those of cirrocumulus and smaller than those of stratocumulus: of medium altitude, about 8000â20,000 feet (2450â6100 meters). Origin of altocumulus Expand. 1890-1895.