alto-cumulus

Science Dictionary
altocumulus   (āl'tō-ky'myə-ləs)  Pronunciation Key 
Plural altocumuli (āl'tō-kym'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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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