Definition from Wiktionary, the free dictionary
fireball (plural fireballs)
- A ball of fire.
- An explosion, which results in a fireball.
- (astronomy) A meteor bright enough to cast shadows.
- A class of sailing dinghy with a single trapeze and a symmetrical spinnaker, sailed by a crew of two.
Derived terms 
A ball of fire
An explosion, which results in a fireball
A meteor bright enough to cast shadows
A class of sailing dinghy
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