Dictionarycu•mu•lusPronunciation: (kyOO'myu-lus), [key] —n., —pl. -lus. 1. a heap; pile. 2. 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: as such clouds develop vertically, they form cumulonimbus. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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