Dictionary definitions
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underwing
From The Collaborative International Dictionary of English v.0.48:
Underwing \Un"der*wing`\, n.
1. (Zool.) One of the posterior wings of an insect.
[1913 Webster]
2. (Zool.) 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}.
[1913 Webster]
