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locknut
lock·nut [ lók nùt ] (plural lock·nuts)


noun 
Definition:
 
1. second nut tightened on first: a second nut tightened on a first to prevent it from loosening
2. self-locking nut: a nut designed to lock itself in place once tightened
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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