alto-stratus

Science Dictionary
altostratus   (āl'tō-strāt'əs)  Pronunciation Key 
Plural altostrati (āl'tō-strāt'ī')
A mid-altitude cloud that extends in flat, smooth sheets or layers of varying thickness. Altostratus clouds generally form between 2,000 and 6,100 m (6,560 and 20,000 ft) and often produce long, steady rain showers. See illustration at cloud.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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