Definitions for underwingˈʌn dərˌwɪŋ
Random House Webster's College Dictionary
one of the hind wings of an insect.
any of several noctuid moths of the genus Catocala, characterized by red-, yellow-, or orange-banded hind wings.
Origin of underwing:
moth having dull forewings and brightly colored hind wings
A hind wing on an insect.
A member of the genus Catocala; a nocturnal moth which usually has brightly coloured underwings.
one of the posterior wings of an insect
any one of numerous species of noctuid moths belonging to Catocala and allied genera, in which the hind wings are banded with red and black or other conspicuous colors. Many of the species are called red underwing