Etymology
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fireball (n.)

also fire-ball, 1550s, from fire (n.) + ball (n.1).

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Definitions of fireball

fireball (n.)
an especially luminous meteor (sometimes exploding);
Synonyms: bolide
fireball (n.)
a highly energetic and indefatigable person;
Synonyms: powerhouse / human dynamo / ball of fire
fireball (n.)
a ball of fire (such as the sun or a ball-shaped discharge of lightning);
fireball (n.)
the luminous center of a nuclear explosion;
From wordnet.princeton.edu