[nim-boh-strey-tuhs, -strat-uhs]
noun, plural nimbostratus.
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).

1885–90; nimbo- + stratus Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nimbostratus (ˌnɪmbəʊˈstreɪtəs, -ˈstrɑːtəs)
n , pl -ti
a dark-coloured rain-bearing stratus cloud

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Science Dictionary
nimbostratus   (nĭm'bō-strāt'əs)  Pronunciation Key 
Plural nimbostrati (nĭm'bō-strāt'ī')
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Nimbostratus clouds bring continuous precipitation that can last for many hours.
One of these types of clouds is called nimbostratus.
Nimbostratus clouds, which are not specifically coded for in the standard synoptic code, were also given a special designation.
Altostratus clouds often precede nimbostratus, which may form from them, if conditions are right.
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