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From The Collaborative International Dictionary of English v.0.48:
Wiper \Wip"er\, n. 1. One who, or that which, wipes. [1913 Webster] 2. Something used for wiping, as a towel or rag. [1913 Webster] 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. [1913 Webster] 4. (Firearms) A rod, or an attachment for a rod, for holding a rag with which to wipe out the bore of the barrel. [1913 Webster]