slow pitch 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.
a variety of softball in which the ball is pitched with an underhand motion at moderate speed in an arc that rises at least six feet above the ground
slow pitch definition by American Heritage Dictionary
Softball in which there are ten players to a team and legal pitches must travel in an arc from three to ten feet high.