plural of knuckleball

(baseball) A pitch thrown with the ball gripped on the fingertips and released with no rotation, which travels over an unpredictable path to the plate due to micro-turbulence in the air.

(intransitive, baseball) To pitch knuckleballs.

(baseball) A baseball pitcher known for throwing knuckleballs.

plural of knuckleballer

present participle of knuckleball

simple past tense and past participle of knuckleball