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Definition of Locknut
1. Noun. Supplementary nut that is screwed down on a primary nut to prevent it from loosening. 
Definition of Locknut
1. a nut which keeps another from loosening [n -S]
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1. Noun. Supplementary nut that is screwed down on a primary nut to prevent it from loosening. 
1. a nut which keeps another from loosening [n -S]