thunderhead
/ˈθʌndərˌhɛd/
noun
- A large, towering cloud that often produces thunder, lightning, and heavy rain; a cumulonimbus cloud.
- Pilots avoid flying near thunderheads because of dangerous turbulence.
- We watched the thunderhead grow taller, its top flattening into an anvil shape.
- The sky darkened as a massive thunderhead rolled in from the west.
Synonyms