Spheres of fire or bright flaming objects, either real explosions or mythical magical balls used as weapons or spells.
Compound of 'fire' (from Old English fyr) and 'ball' (from Old Norse bollr). Medieval and fantasy literature popularized the term for magical projectiles.
Real meteors that enter Earth's atmosphere fast enough create fireballs visible in daylight—the Chelyabinsk meteor in 2013 was so bright it outshone the sun and caused burns from 40 miles away.
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