n. One who or that which washes: as, a washer of clothes; a dish-washer; a wool-washer.n. An annular piece of leather, rubber, metal, or other material placed at a joint in a water-pipe or faucet to make the joint tight and prevent leakage, or over a bolt, or a similar piece upon which a nut may be screwed.n. A similar article forming an ornament, as at the socket or pin that holds any adjustable utensil: as, the mother-of-pearl washers of a fan. Compare rosette.n. In paper manufacturing, a straining-and-washing machine used in the process of cleaning rags, to bring them to a pulpy condition; a beating-engine.n. In plumbing, the outlet of a cistern. It includes the pipe, the joint or union, and the plug, as for a basin.n. A washing-machine: as, a clothes-washer, window-washer, gold-washer.n. In coal-mining (short for coal-washer), any machine for washing coal.n. The wagtail, a bird. Also dish-washer, peggy dish-washer, moll-washer, molly or polly wash dish, washtail, nanny washtail, etc. See cut under wagtail.n. The wash-bear.To fit with washers.