1. one of the hind wings of an insect.
  2. any of several noctuid moths of the genus Catocala, characterized by red-, yellow-, or orange-banded hind wings.

Origin of underwing

First recorded in 1525–35; under- + wing
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for underwing

Historical Examples of underwing

British Dictionary definitions for underwing


  1. the hind wing of an insect, esp when covered by the forewing
  2. See red underwing, yellow underwing
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