washer
wash·er / ˈwäshər; ˈwôsh-/ • n. 1. a person or device that washes something: a glass washer. ∎ a washing machine.2. a small flat ring made of metal, rubber, or plastic fixed under a nut or the head of a bolt to spread the pressure when tightened or between two joining surfaces as a spacer or seal.
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washer