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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Al·to-cu·mu·lus n.  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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From: WordNet (r) 2.0

 altocumulus
      n : a cumulus cloud at an intermediate altitude of 2 or 3 miles
          [syn: altocumulus cloud]
      [also: altocumuli (pl)]