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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 altostratus, Al·to-stra·tus n.  Meteor. A cloud formation similar to cirro-stratus, but heavier and at a lower level; a stratus cloud at an intermediate altitude of 2 or 3 miles.
 

From: WordNet (r) 2.0

 altostratus
      n : a stratus cloud at an intermediate altitude of 2 or 3 miles
          [syn: altostratus cloud]
      [also: altostrati (pl)]