PATAGIA
Noun
patagia
plural of patagium
Source: Wiktionary
PATAGIUM
Pa*ta"gi*um, n.; pl. Patagia. Etym: [L., an edge or border.]
1. (Anat.)
Definition: In bats, an expansion of the integument uniting the fore limb
with the body and extending between the elongated fingers to form the
wing; in birds, the similar fold of integument uniting the fore limb
with the body.
2. (Zoöl.)
Definition: One of a pair of small vesicular organs situated at the bases
of the anterior wings of lepidopterous insects. See Illust. of
Butterfly.
Source: Webster’s Unabridged Dictionary 1913 Edition