I. ˈ ̷ ̷ ̷ ̷ˌ ̷ ̷ noun
Etymology: under (III) + wing
1. : one of the posterior wings of an insect
underwing of a moth
2. : any of numerous noctuid moths belonging to Catocala and related genera and having the hind wings banded with red and black or other contrasting colors
3. : the surfaces underneath a bird's wing
II. adjective
Etymology: under (II) + wing, n.
: placed or growing underneath the wing
underwing converts