wing nut

or wing·nut


noun

a nut having two flat, widely projecting pieces such that it can be readily tightened with the thumb and forefinger.

Origin of wing nut

First recorded in 1895–1900
Also called butterfly nut, thumbnut.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for wingnut

wing nut


noun

a threaded nut tightened by hand by means of two flat lugs or wings projecting from the central bodyAlso 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