A spitball is an illegal baseball pitch in which the ball has been altered by the application of saliva, petroleum jelly, or some other foreign substance.
This technique alters the wind resistance and weight on one side of the ball, causing it to move in an atypical manner. It may also cause the ball to "slip" out of the pitcher's fingers without the usual spin that accompanies a pitch. In this sense, a spitball can be thought of as a fastball with knuckleball action.
Alternative names for the spitball are spitter, mud ball, shine ball, supersinker, vaseline ball (because originally, Vaseline was used to give the ball a little more break), and emery ball, although technically, an emery ball is one where the ball has been abraded in much the same way that the original cut ball had been physically cut (an emery ball is also known as a scuff ball).
The name dry spitter is sometimes used to describe a pitch that moves like a spitball without saliva, such as the forkball or split-finger fastball. It is sometimes used simply as slang for the knuckleball.
There is also the remote term of God-given spitter, which is when the ball is naturally dampened by moist air or light rainfall, which allows pitchers to be able to throw pitches with sharper breaks, much like a spitball.
In today's game, pitchers are allowed to moisten their fingers with saliva, so long as they wipe their fingers on their uniform before again touching the baseball.
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This article uses material from the Wikipedia articles "Baseball" and "Spitball", which is released under the Creative Commons Attribution-Share-Alike License 3.0.
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