Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A usually thin nut screwed down on another nut to prevent it from loosening.
  • noun A self-locking nut.

from The Century Dictionary.

  • noun A supplementary nut screwed down upon another to prevent it from shaking loose; a jam-nut, check-nut, or pinch-nut.

from the GNU version of the Collaborative International Dictionary of English.

  • noun a supplementary nut that is screwed down on a primary nut to prevent it from loosening; a check nut.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A second nut, screwed down onto another in order to prevent it slipping

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun supplementary nut that is screwed down on a primary nut to prevent it from loosening

Etymologies

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