thundercloud

Definition of Thundercloud in English :

a dark cloud of great vertical extent charged with electricity; associated with thunderstorms

WordNet Lexical Database for English. Princeton University. 2010.

Thundercloud

noun

1.

a towering electrically charged cumulonimbus cloud associated with thunderstorms

2.

anything that is threatening

noun

a storm cloud charged with electricity and producing lightning and thunder

n.

1. A large dark cloud charged with electricity and producing thunder and lightning; a cumulonimbus cloud.

2. Something menacing or dreadful: thunderclouds of impending war.