Meaning of “washer” in the English Dictionary

"washer" in American English

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washernoun [ C ]

us /ˈwɑʃ·ər, ˈwɔ·ʃər/

a flat ring of metal, rubber, or plastic that is used to make a tighter connection between two pieces or parts of something

(Definition of “washer” from the Cambridge Academic Content Dictionary © Cambridge University Press)