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altostratus

[al-toh-strey-tuh s, -strat-uh s] /ˌæl toʊˈstreɪ təs, -ˈstræt əs/
noun, plural altostratus. Meteorology
1.
a cloud of a class characterized by a generally uniform gray sheet or layer, lighter in color than nimbostratus and darker than cirrostratus: of medium altitude, about 8000–20,000 feet (2450–6100 meters).
Origin
1890-1895
1890-95; alto- + stratus
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for altostratus

altostratus

/ˌæltəʊˈstreɪtəs; -ˈstrɑː-/
noun (pl) -ti (-taɪ)
1.
a layer cloud at an intermediate height of about 2400 to 6000 metres (8000 to 20 000 feet)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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altostratus in Science
altostratus
  (āl'tō-strāt'əs)   
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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