thundercloud

[ thuhn-der-kloud ]

/ ˈθʌn dərˌklaʊd /

cumulonimbus.

Origin of thundercloud

First recorded in 1690–1700; thunder + cloud

For a moment, the gray plane recalled a thundercloud against the clear blue sky.

How the Dead Come Home From Afghanistan |Nick Willard |May 9, 2014 |DAILY BEAST
Lovely to him as the colours of the rainbow on the thundercloud gleamed the azure of his home.

Darkness and Dawn |Frederic W. Farrar
The young woman was at her desk with a face like a thundercloud.

Red Masquerade |Louis Joseph Vance
Also the first few drops that come from the thick, hot lips of the thundercloud are usually immense.

Reading the Weather |Thomas Morris Longstreth

At this retort a snicker went up in the crowd, and Shan turned upon his followers with a brow like a thundercloud.

Ted Strong's Motor Car |Edward C. Taylor
Mr. Walraven bit his lip, the baronet looked like a thundercloud, but both took their places.

The Unseen Bridgegroom |May Agnes Fleming

thundercloud

/ (ˈθʌndəˌklaʊd) /

a towering electrically charged cumulonimbus cloud associated with thunderstorms

anything that is threatening

thundercloud

[ thŭn′dər-kloud′ ]

See cumulonimbus.