the loud noise that you hear during a storm, usually after a flash of lightning:
a storm with thunder and lightning
clap/crack/roll/crash of thunder
Suddenly there was a great crash of thunder.
rumble/roar of thunder
We could hear the rumble of distant thunder.
The thunder crashed and boomed around us.
a loud deep noise:
She heard the thunder of hooves behind her.
if someone has a face like thunder, they look very angry