interfemoral membrane
/ˌɪntəfˈɛməɹəl ˈmɛmbɹeɪn/
n
English · interfemoral membrane中文 · 股间膜Español · membrana interfemoralFrançais · membrane interfémorale
意味：Fold of smooth skin between the legs and the tail; it provides stability when the bat is in flight and capturing prey.