altostratus

Definitions

  • WordNet 3.6
    • n altostratus a stratus cloud at an intermediate altitude of 2 or 3 miles
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Webster's Revised Unabridged Dictionary
    • n altostratus (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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Century Dictionary and Cyclopedia
    • n altostratus A thin horizontal sheet of clouds, usually disappearing slowly: apparently a lower layer of what under favorable circumstances might have been a cumulus cloud. The outer surface, melting away at sunset, gives rise to beautiful sunset cloud-colors by reflection of light from the sun or the sky beyond the western horizon.
    • n altostratus A rather high cloud covering the sky as a layer whose lower surface is horizontal. The extreme boundaries of such an alto-stratus cloud thin away into a series of alto-cumuli.
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Etymology

Webster's Revised Unabridged Dictionary
L. altus, high + L. & E. stratus,