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washer
noun
- a person who washes
- a flat disk or ring of metal, leather, rubber, etc., used variously to make a seat for the head of a bolt or for a nut or faucet valve, to lock a nut in place, to provide a bearing surface, to serve as a seal, etc.
- a machine for washing something, as clothes or dishes
- a device for washing gases
See washer in American Heritage Dictionary 4
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