noun, plural cirrocumulus.
a cirriform cloud of a class characterized by thin, white patches, each of which is composed of very small granules or ripples: of high altitude, about 20,000–40,000 feet (6000–12,000 meters).

1795–1805; cirro- + cumulus

cirrocumular, cirrocumulative [sir-oh-kyoo-myuh-ley-tiv, -luh-tiv] , cirrocumulous, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cirrocumulus (ˌsɪrəʊˈkjuːmjʊləs)
n , pl -li
meteorol See also mackerel sky a high cloud of ice crystals grouped into small separate globular masses, usually occurring above 6000 metres (20 000 feet)

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1803, from cirrus + cumulus.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
cirrocumulus   (sîr'ō-kym'yə-ləs)  Pronunciation Key 
Plural cirrocumuli (sîr'ō-kym'yə-lī')
A high-altitude cloud composed of a series of small, regularly arranged cloudlets in the form of ripples or grains. Cirrocumulus clouds generally form between 6,100 and 12,200 m (20,000 and 40,000 ft) and are composed exclusively of ice crystals. See illustration at cloud.
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