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The Collaborative International Dictionary
Alto-stratus

altostratus \altostratus\, Alto-stratus \Al`to-stra"tus\, n. [L. altus high + L. & E. stratus.] (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.