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cu·mu·lus  (kymy-ls)
n. pl. cu·mu·li (-l)
1. A dense, white, fluffy, flat-based cloud with a multiple rounded top and a well-defined outline, usually formed by the ascent of thermally unstable air masses.
2. A pile, mound, or heap.

[Latin, heap; see keu- in Indo-European roots.]

cumulus [ˈkjuːmjʊləs]
n pl -li [-ˌlaɪ]
1. (Earth Sciences / Physical Geography) a bulbous or billowing white or dark grey cloud associated with rising air currents Compare cirrus [1] stratus
2. (Life Sciences & Allied Applications / Biology) Histology the mass of cells surrounding a recently ovulated egg cell in a Graafian follicle
[from Latin: mass]

cumulus  (kymy-ls)
Plural cumuli (kymy-l)
A dense, white, fluffy cloud with a flat base, a multiple rounded top, and a well-defined outline. The bases of cumulus clouds form primarily in altitudes below 2,000 m (6,560 ft), but their tops can reach much higher. Cumulus clouds are generally associated with fair weather but can also bring rain when they expand to higher levels. The clouds edges are well-defined when they are composed of water droplets and fuzzy when made up of ice crystals. See illustration at cloud.

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