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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Lock wash·er n. A washer that is not completely smooth or flat, designed to prevent a nut from loosening, placed under the nut on a screw or bolt.
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From: WordNet (r) 2.0

 lock washer
      n : washer that prevents a nut from loosening [syn: lockring,
          lock ring]