al·to·cu·mu·lus  (āl'tō-kyōō'myə-ləs)  n. A cloud formation of rounded, fleecy, white or gray masses. [Latin altus, high; see al-2 in Indo-European roots + cumulus.] |
altocumulus (āl'tō-ky 'myə-ləs) Pronunciation Key
Plural altocumuli (āl'tō-ky m'yə-lī')
A mid-altitude cloud composed of fleecy white or gray patches or bands. Altocumulus clouds generally form between 2,000 and 6,100 m (6,560 and 20,000 ft). See illustration at cloud. |