vespertilian

adjective

ves·​per·​til·​ian ˌve-spər-ˈti-lē-ən 

-ˈtil-yən

: of, relating to, or resembling a bat

flaunts vespertilian wing and cloven hoof

—Robert Graves

Word History

Etymology

Latin vespertilio bat, from vesper

First Known Use

1874, in the meaning defined above