The Collaborative International Dictionary of English v.0.48:

Noctule \Noc"tule\ (?; 135), n. [F., fr. L. noctua a night owl,
   fr. nox, noctis, night.] (Zool.)
   A large European bat (Vespertilio altivolans syn.
   Noctulina altivolans).
   [1913 Webster]