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English definition of “washer”

washer

noun [C] (RING)    /ˈwɒʃ.ər/ US  /ˈwɑː.ʃɚ/
a flat ring of metal, rubber, or plastic that is put somewhere, especially between a screw or bolt and a surface, or between joined pipes, in order to make a better connection between themPlumbing and pipes and sewage
(Definition of washer noun (RING) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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