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Meaning of lock nut

lock' nut"

Pronunciation: [key]
— Mach. Mach.
  1. a nut specially constructed to prevent its coming loose, usually having a means of providing extra friction between itself and the screw.
  2. Also calleda thin supplementary nut screwed down upon a regular nut to prevent its loosening. See illus. under
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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