Al′to–cu″mu‐lus (?), n. [L. altus high + L. & E. cumulus.] (Meteor.) A fleecy cloud formation consisting of large whitish or grayish globular cloudlets with shaded portions, often grouped in flocks or rows.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.