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cumulo-or cumuli- or cumul-
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
cu•mu•lus(ˈkyu myə ləs)
n., pl. -li (-ˌlaɪ)
1. a cloud of a class characterized by dense individual elements in the form of puffs, mounds, or towers, with flat bases and tops that often resemble cauliflower.
2. a heap; pile.
[1650–60; < New Latin (Latin: mass, pile)]
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