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altostratus

[ al-toh-strey-tuhs, -strat-uhs ]

noun

, Meteorology.
, plural al·to·stra·tus.
  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).

altostratus

/ -ˈstrɑː-; ˌæltəʊˈstreɪtəs /

noun

  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

altostratus

/ ăl′tō-străt′əs /

, Plural altostrati ăl′tō-străt′ī′

  1. 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.
  2. See illustration at cloud
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Word History and Origins

Origin of altostratus1

First recorded in 1890–95; alto- + stratus

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