noun

• (figurative)
  "But ſure in a family it bodeth moſt bad, vvhen tvvo firebals (huſbands and vvives anger) come both together."
• (figurative)
• (astronautics) A bright glow caused by a spacecraft re-entering an atmosphere.
• (astronomy) A meteor bright enough to cast shadows; a bolide.
  "[page 1] There ſeem to be three concentric ſtrata of our incumbent atmoſphere; in vvhich, or betvveen them, are produced four kinds of meteors; lightning, ſhooting ſtars, fire-balls, and northern lights. […] [page 2] Dr. [Charles] Blagden has related the hiſtory of another large meteor, or fire-ball, vvhich vvas ſeen the 18th of Auguſt, 1783, vvith many ingenious obſervations and conjectures."

adj

• (slang) Excellent, terrific.
  ""Give us a hand," said Mack. "How's she look?" / "Fireball," said Eddie."

verb

• (transitive, fiction, chiefly fantasy, science fiction) To attack (someone or something) with balls of fire.
• (intransitive)
  "The car swerved off a road, hit a wall, and fireballed as the petrol tank exploded."
• (intransitive)
  "But the swoon was only brief. [Klay] Thompson scorched his way to 27 first-half points, the Warriors fireballed back into a 17-point lead and a statement half was sealed from the deeeeeeeeeeeeeeeeep left corner, early in the clock and without a dribble – vintage Klay, vintage Warriors."
• (intransitive)