Source : Webster's Revised Unabridged Dictionary (1913)

Serotine \Ser"o*tine\, n. [F. s['e]rotine, fr. L. serotinus that
   comes or happens late.] (Zo["o]l.)
   The European long-eared bat ({Vesperugo serotinus}).

Source : WordNet®

serotine
     n : common European brown bat [syn: {European brown bat}, {Eptesicus
         serotinus}]