Definitions for "altostratus"
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.
A type of cloud that is grey or bluish striated and either fibrous or a uniform sheet producing light drizzle. It is formed at an altitude of approximately 23,000 to 24,000 thousand feet.
An extended cloud formation of bluish or gray sheets or layers.