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wing nut

noun
1.
a nut having two flat, widely projecting pieces such that it can be readily tightened with the thumb and forefinger.
Also, wingnut.
Also called butterfly nut, thumbnut.
Origin
1895-1900
1895-1900
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for wing-nut

wing nut

noun
1.
a threaded nut tightened by hand by means of two flat lugs or wings projecting from the central body Also called butterfly nut
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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8
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