vespertilio

from WordNet (r) 3.0 (2006)

Vespertilio
    n 1: a genus of Vespertilionidae [syn: {Vespertilio}, {genus
         Vespertilio}]

from The Collaborative International Dictionary of English v.0.48

Vespertilio \Ves`per*til"i*o\, n. [L., a bat.] (Zool.)
   A genus of bats including some of the common small
   insectivorous species of North America and Europe.
   [1913 Webster]