n. A member of the genus Catocala; a nocturnal moth which usually has brightly coloured underwings.
the GNU version of the Collaborative International Dictionary of English
n. One of the posterior wings of an insect.
n. 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.
The Century Dictionary and Cyclopedia
n. A moth whose under wings are conspicuous in color or otherwise; specifically, a moth of the genus Catocala.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. moth having dull forewings and brightly colored hind wings
Word Usage
"It has several minor failings — among them limited a internal weapons carriage, rendering underwing carriage necessary (thus negating most of its stealth advantages), along with an inability to fire its air-to-air weapons at maximum speed."