The Collaborative International Dictionary of English v.0.48:

Mandolin \Man"do*lin\, Mandoline \Man"do*line\, n. [F.
   mandoline, It. mandolino, dim. of mandola, fr. L. pandura.
   See Bandore.] (Mus.)
   A small and beautifully shaped instrument resembling the
   lute.
   [1913 Webster]