n. 1. One who, or that which, slides; especially, a sliding part of an instrument or machine. [ 1913 Webster ] 2. (Zool.) The red-bellied terrapin (Pseudemys rugosa). [ Local, U. S. ] [ 1913 Webster ] 3. (Zool.) any of several North American freshwater turtles of the genus Chrysemis; some, such as Chrysemis scripta are sold commercially as pets. [ RHUD ] [ PJC ] 4. (Baseball) a fast pitch that breaks slightly just in front of the batter, in the same direction as a curve ball (i. e. , away from the side from which it was thrown). [ PJC ] Slider pump, a form of rotary pump. [ 1913 Webster ]
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