A dark grey cloud bearing rain WordNet 3.0 & Open English WordNet

A nimbostratus cloud is a multilevel, amorphous, nearly uniform, and often dark-grey cloud that usually produces continuous rain, snow, or sleet, but no lightning or thunder. Wikipedia

A cloud type Wikipedia Disambiguation

Precipitating cloud Wikidata

A gray rain cloud. OmegaWiki

According to the World Meteorological Organization, a mid-level, principal cloud type, generally formless and dark grey in colour, which forms from altostratus occurring in layers at the middle altitude of the troposphere (usually above 2400 metres). Nimbostratus usually brings precipitation as the mid-level clouds thicken and subside into the low level of the troposphere. Frontal or cyclonic lift can also carry the top of a deep nimbostratus layer into the high levels of the troposphere. Also classified or characterized as multi-level; abbreviated Ns. Wiktionary

Cloud type. Wiktionary (translation)

Rain cloud. Wiktionary (translation)

A cloud from which rain is falling. Wiktionary

Cloud from which rain is falling. Wiktionary (translation)