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cumulus

cu·mu·lus [ kymyələss ] (plural cu·mu·li [ kymyə l ])


noun 
Definition:
 
1. large fluffy cloud: a large white or gray cloud with a flat base and a rounded fluffy top, or a mass of such clouds, developing as a result of rising hot air currents

2. heap: a mass or heap

[Mid-17th century. < Latin, "heap, pile"]

cu·mu·lous adjective
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