Slider

Slid"er (?), a. See Slidder. [Obs.] Chaucer.

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

2. (Zoöl.) The red-bellied terrapin (Pseudemys rugosa). [Local, U. S. ]

Slider pump, a form of rotary pump.