nim·bo·stra·tus

[nim-boh-strey-tuhs, -strat-uhs]
noun, plural nim·bo·stra·tus.
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).

Origin:
1885–90; nimbo- + stratus

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
nimbostratus (ˌnɪmbəʊˈstreɪtəs, -ˈstrɑːtəs) [Click for IPA pronunciation guide]
 
n , pl -ti
a dark-coloured rain-bearing stratus cloud

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Nimbostratus is always a great word to know.
So is callithumpian. Does it mean:
a scrap or morsel of food left at a meal.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
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
Altostratus clouds often precede nimbostratus, which may form from them, if conditions are right.
Nimbostratus clouds bring continuous precipitation that can last for many hours.
Nimbostratus clouds, which are not specifically coded for in the standard synoptic code, were also given a special designation.
One of these types of clouds is called nimbostratus.
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