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The Collaborative International Dictionary
Slider pump

Slider \Slid"er\, n.

  1. One who, or that which, slides; especially, a sliding part of an instrument or machine.

  2. (Zo["o]l.) The red-bellied terrapin ( Pseudemys rugosa).

  3. (Zo["o]l.) any of several North American freshwater turtles of the genus Chrysemis; some, such as C. scripta are sold commercially as pets.
    --[RHUD]

  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).

    Slider pump, a form of rotary pump.

Wiktionary
slider pump

n. A form of rotary pump.