altostratus
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Related to altostratus: nimbostratus, altocumulus
al·to·strat·us
(ăl′tō-străt′əs, -strā′təs)n.
An extended cloud formation of bluish or gray sheets or layers.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
altostratus
(ˌæltəʊˈstreɪtəs; -ˈstrɑː-)n, pl -ti (-taɪ)
(Physical Geography) a layer cloud at an intermediate height of about 2400 to 6000 metres (8000 to 20 000 feet)
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
al•to•stra•tus
(ˌæl toʊˈstreɪ təs, -ˈstræt əs)n., pl. -stra•ti (-ˈstreɪ taɪ, -ˈstræt aɪ)
a cloud of a class characterized by a generally uniform gray sheet or layer: of medium altitude, 8000–20,000 ft. (2450–6100 m).
[1890–95]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
al·to·strat·us
(ăl′tō-străt′əs) A cloud formation that extends in flat, smooth sheets or layers of varying thickness. Altostratus clouds form at middle levels of the atmosphere.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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| Noun | 1. |  altostratus - a stratus cloud at an intermediate altitude of 2 or 3 milesstratus, stratus cloud - a large dark low cloud |
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Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005