from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A slow pitch that has almost no spin and veers erratically, thrown by gripping the ball with the nails or knuckles near the tips of the index and middle fingers, and often the third finger.


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  • Also knuckleball. A randomly fluttering pitch thrown by gripping the ball with the tips or nails of two or three fingers. See Knuckle Up.

    February 12, 2008