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nimbostratus

[nim-boh-strey-tuh s, -strat-uh s]
noun, plural nim·bo·stra·tus.
  1. a cloud of a class characterized by a formless layer that is almost uniformly dark gray; a rain cloud of the layer type, of low altitude, usually below 8000 feet (2440 meters).
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Origin of nimbostratus

First recorded in 1885–90; nimbo- + stratus
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for nimbostratus

nimbostratus

noun plural -ti (-taɪ)
  1. a dark-coloured rain-bearing stratus cloud
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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

Word Origin and History for nimbostratus

n.

1932 (earlier use from late 19c. refers to different cloud types), from Modern Latin nimbus (see nimbus) + connecting element -o- + stratus (see stratus).

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Online Etymology Dictionary, © 2010 Douglas Harper
nimbostratus in Science

nimbostratus

[nĭm′bō-străt′əs]
Plural nimbostrati (nĭm′bō-străt′ī′)
  1. A dark, gray, mid-altitude cloud that often covers the entire sky and precipitates rain, snow, or sleet. Nimbostratus clouds generally form around 2,000 m (6,560 ft) but often extend to much higher and lower altitudes. See illustration at cloud.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.