/al'toh kyooh"myeuh leuhs/ , n. , pl. altocumulus . Meteorol.
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 8000-20,000 ft. (2450-6100 m).
[ 1890-95; ALTO- + CUMULUS ]