Wash'er, n.

(wŏsh'er), n. [A-S. wäs-cere.]

1. One who, or that which, washes.
2. A ring of metal, leather, or other material, used to relieve friction, to secure tightness of joints, or for other purposes, as between the hub of a wheel and the linchpin or the shoulder of the axle, beneath the head of a screw, and the like.