Washer

1. (n.) One who, or that which, washes.
2. (n.) 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. (n.) A fitting, usually having a plug, applied to a cistern, tub, sink, or the like, and forming the outlet opening.
4. (n.) The common raccoon.
5. (n.) Same as Washerwoman, 2.