/pəˈtājēəm/
Noun, pl. patagia
1. The thin membrane that extends between the limbs and body of a bat or of gliding mammals. (wiktionary.org)
2. A similar membrane between the body and wing of a bird. (wiktionary.org)
3. The fold of skin connecting the forelimbs and hind limbs of some tetrapods (as flying squirrels). (merriam-webster.com)
4. A lobe that covers the wing joint in many moths. (Google Dictionary)