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[al-toh-kyoo-myuh-luh s] /ˌæl toʊˈkyu myə ləs/
noun, plural altocumulus. Meteorology
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 feet (2450–6100 meters).
Origin of altocumulus
1890-95; alto- + cumulus Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for altocumulus


noun (pl) -li (-laɪ)
a globular cloud at an intermediate height of about 2400 to 6000 metres (8000 to 20 000 feet)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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altocumulus in Science
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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