Wiper \Wip"er\, n.

1. One who, or that which, wipes.

2. Something used for wiping, as a towel or rag.

3. (Mach.) A piece generally projecting from a rotating or swinging piece, as an axle or rock shaft, for the purpose of raising stampers, lifting rods, or the like, and leaving them to fall by their own weight; a kind of cam.

4. (Firearms) A rod, or an attachment for a rod, for holding a rag with which to wipe out the bore of the barrel.

Source: Webster's Revised Unabridged Dictionary (1913)