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Dictionary

lock' nut"

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 called jam nut. a thin supplementary nut screwed down upon a regular nut to prevent its loosening. See illus. under nut. Also,lock'nut".

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

lockjaw

lockout

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