locknut

noun
lock·nut | \ˈläk-ˌnət \

Definition of locknut 

1 : a nut screwed down hard on another to prevent it from slacking back

2 : a nut so constructed that it locks itself when screwed tight against another part

First Known Use of locknut

1855, in the meaning defined at sense 1

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The first known use of locknut was in 1855

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