nimbostratus[nim′bō strāt′əs, -strat′əs]
nimbostratus definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
the type of extensive gray cloud that obscures the sun, found at low altitudes and consisting of dense, dark layers of water droplets, rain, or snow
Origin: ModL: see nimbus and amp; stratus
nimbostratus definition by American Heritage Dictionary
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
noun pl. nim·bo·stra·ti
A low, gray, often dark cloud that precipitates rain, snow, or sleet.
Origin: nimb(us) + stratus.
nimbostratus - Science Definition
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.