Bible Dictionaries
Underwing

Webster's Dictionary

(1):

(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.

(2):

(n.) One of the posterior wings of an insect.

Bibliography Information
Webster, Noah. Entry for 'Underwing'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​u/underwing.html. 1828.