Origin of altocumulusalto- + cumulus
the type of white or gray cloud that resembles a sharply defined, wavy patch, found at intermediate altitudes and consisting of small water droplets
A cloud formation of rounded, fleecy, white or gray masses.
Origin of altocumulusLatin altus high ; see al-2 in Indo-European roots. cumulus
Plural altocumuli (ălˌ◌tō-kymˌ◌yə-līˌ◌)
A mid-altitude cloud composed of fleecy white or gray patches or bands. Altocumulus clouds generally form between 2,000 and 6,100 m (560 and 20,000 ft).
See illustration at cloud
- (physics, meteorology) A principal medium-level cloud type, white and/or gray in color, which occurs as a layer or patch with a waved aspect, the elements of which appear as laminae, rounded masses, or rolls. These elements usually are sharply outlined, but they may become partly fibrous or diffuse; they may or may not be merged; they generally have shadowed parts; and, by convection, when observed at an angle of more than 30° above the horizon, subtend an angle between 1 degrees and 5 degrees. (Abbreviated Ac.)