nimbostratus[nim′bō strāt′əs, -strat′əs]
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 of nimbostratusModL: see nimbus and amp; stratus
A low, gray, often dark cloud that precipitates rain, snow, or sleet.
Origin of nimbostratusnimb(us) + stratus.