vespertilio

noun
ves·​per·​til·​io

Definition of vespertilio

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 plural -s : any bat of the genus Vespertilio broadly : bat

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History and Etymology for vespertilio

New Latin, from Latin, bat, from vesper evening

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