Wiper /(?)/

Wip·er

Wiper

n.
  1. One who, or that which, wipes.
  2. Something used for wiping, as a towel or rag.
  3. 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. (Mach.)
  4. A rod, or an attachment for a rod, for holding a rag with which to wipe out the bore of the barrel. (Firearms)