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lock·nutalso lock nut (lŏk′nŭt′)
1. A usually thin nut screwed down on another nut to prevent it from loosening.
2. A self-locking nut.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. a nut specially constructed to prevent its coming loose, usu. having a means of providing extra friction between itself and the screw.
2. a thin supplementary nut screwed down upon a regular nut to prevent its loosening.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.