Cumulus definition

kyo͝omyə-ləs
Frequency:
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.
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A heap; mass; pile.
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A large white puffy cloud that develops through convection. On a hot, humid day, they can form towers and even become cumulonimbus clouds.
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A mound or heap.
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A pile, mound, or heap.
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The type of bright, billowy cloud with a dark, flat base, that develops vertically through all cloud levels and consists mostly of water droplets.
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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.
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Alternative Forms

Alternative Form of cumulus - cumulous

Other Word Forms

Noun

Singular:
cumulus
Plural:
cumuli

Origin of cumulus

  • Latin heap keuə- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Latin cumulus.

    From Wiktionary