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a threaded nut tightened by hand by means of two flat lugs or wings projecting from the central body
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
wing nut[′wiŋ ‚nət]
An internally threaded fastener with wings to permit it to be tightened or loosened by finger pressure only. Also known as butterfly nut.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A nut having projections so that it can be tightened with one finger and the thumb.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.