washern.[AS. wscere.]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. (Zol.) The common raccoon.()5. (Zol.) Same as Washerwoman, 2.()