alto-cumulus

altocumulus

[al-toh-kyoo-myuh-luhs]
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:
1890–95; alto- + cumulus

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Collins
World English Dictionary
altocumulus (ˌæltəʊˈkjuːmjʊləs)
 
n , pl -li
a globular cloud at an intermediate height of about 2400 to 6000 metres (8000 to 20 000 feet)

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
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
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