\Wash"er\, n. [AS. w[ae]scere.]
1. One who, or that which, washes.
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.
3. (Plumbing) A fitting, usually having a plug, applied to a
   cistern, tub, sink, or the like, and forming the outlet
   opening.
4. (Zo["o]l.) The common raccoon.
5. (Zo["o]l.) Same as {Washerwoman}, 2. [Prov. Eng.]