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Latin word vespertilio comes from Proto-Indo-European *kʷsep-, Proto-Indo-European *wekʷsperos, and later Proto-Indo-European *wek(ʷ)speros (Evening.)
*kʷsep- (Proto-Indo-European)
*wekʷsperos (Proto-Indo-European)
*wek(ʷ)speros (Proto-Indo-European)
Evening.
*wesperos (Proto-Italic)
vesper (Latin)
(by extension) the West. (by extension) the evening star. Supper, dinner (evening meal). The evening or vespers.
vespertilio (Latin)
A bat (animal).