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