The Collaborative International Dictionary of English v.0.48:

Ocarina \Oc`a*ri"na\, n. [Cf. It. carino pretty.] (Mus.)
   A kind of small simple wind instrument.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

ocarina
    n 1: egg-shaped terra cotta wind instrument with a mouthpiece
         and finger holes [syn: ocarina, sweet potato]

Moby Thesaurus II by Grady Ward, 1.0:

49 Moby Thesaurus words for "ocarina":
   English horn, Pandean pipe, aulos, basset horn, basset oboe,
   bassoon, bombard, clarinet, contrabassoon, contrafagotto, cromorne,
   double bassoon, double reed, fife, fipple flute, flageolet, flute,
   hautboy, heckelphone, hornpipe, licorice stick, musette,
   oaten reed, oboe, oboe da caccia, panpipe, penny-whistle, piccolo,
   pipe, pommer, recorder, reed, reed instrument, sax, saxophone,
   shawm, single reed, single-reed instrument, sonorophone,
   sweet potato, syrinx, tabor pipe, tenoroon, tin-whistle, whistle,
   woods, woodwind, woodwind choir, woodwind instrument