knuckle ball definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
Baseball a slow pitch without spin thrown with the first knuckles, or the nails, of the middle two or three fingers pressed against the ball
also called knuckler
knuckle ball definition by American Heritage Dictionary
or knuck·le·ballnoun Baseball
A slow, randomly fluttering pitch thrown by gripping the ball with the tips or nails of two or three fingers.
- knuckˈle·ballˌer noun