thundercloud

[thuhn-der-kloud] /ˈθʌn dərˌklaʊd/

noun

Also, thunderclouds.

Origin

1690-1700; thunder + cloud

Examples from the web for thundercloud

Against the grey rock of the kopjes it showed no more than a crow against a thundercloud.
Atmospheric scientists know that ice particles in a thundercloud become slightly charged.
They observed five jets spreading outwards and upwards from the thundercloud.
When many small pieces of these frozen raindrops collide with each other in a thundercloud, they create an electrical charge.
Positive strikes are less common and come from the higher regions of the thundercloud.
Guide discussion of the party, the scowling thundercloud piñata and their efforts to break it.

British Dictionary definitions for thundercloud

/ˈθʌndəˌklaʊd/

noun

a towering electrically charged cumulonimbus cloud associated with thunderstorms

anything that is threatening

thundercloud in Science

thundercloud

(thŭn'dər-kloud')
See cumulonimbus.