rain cloud

• raincloud

rain cloud (plural rain clouds)

1. A cloud from which rain is falling or may fall.
   • 1936, F.J. Thwaites, chapter XXII, in The Redemption, Sydney: H. John Edwards, published 1940, page 214:

     Between the grey mist of rainclouds the sun suddenly appeared to mottle the wet asphalt of Marble Arch in patches of silver and ebony.

   • 1947 January and February, O. S. Nock, “"The Aberdonian" in Wartime”, in Railway Magazine, page 7:

     During this fine run through Fife the weather had deteriorated rapidly, and as we passed Wormit and came onto the Tay Bridge heavy rain clouds were piled over the sea.

• (cloud from which rain is falling): nimbus

• storm cloud

• uncordial