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From The Collaborative International Dictionary of English v.0.48:
Washer \Wash"er\, n. [AS. w[ae]scere.] 1. One who, or that which, washes. [1913 Webster] 2. A ring of metal, leather, or other material, or a perforated plate, used for various purposes, as around a bolt or screw to form a seat for the head or nut, or around a wagon axle to prevent endwise motion of the hub of the wheel and relieve friction, or in a joint to form a packing, etc. [1913 Webster] 3. (Plumbing) A fitting, usually having a plug, applied to a cistern, tub, sink, or the like, and forming the outlet opening. [1913 Webster] 4. (Zool.) The common raccoon. [1913 Webster] 5. (Zool.) Same as Washerwoman, 2. [Prov. Eng.] [1913 Webster]