The Collaborative International Dictionary of English v.0.48:

Pallone \Pal*lo"ne\, n. [It., a large ball, fr. palla ball. See
   Balloon.]
   An Italian game, played with a large leather ball.
   [1913 Webster]

WordNet (r) 3.0 (2006):

pallone
    n 1: an Italian game similar to tennis