ˌ ̷ ̷ ̷ ̷ˈtilē(ˌ)ō noun
Etymology: New Latin, from Latin, bat, from vesper evening — more at west
1. capitalized : the type genus of Vespertilionidae formerly comprehensive but now comprising solely the frosted bat ( V. murinus ) or slightly extended to include the serotine and the American brown bats which are more often placed in the genus Eptesicus
2. -s : any bat of the genus Vespertilio ; broadly : bat