The Collaborative International Dictionary of English v.0.48:

Sybarite \Syb"a*rite\, n. [L. Sybarita, Gr. ?, fr. ?, a city in
   Italy, noted for the effeminacy and voluptuousness of its
   inhabitants; cf. F. Sybarite.]
   A person devoted to luxury and pleasure; a voluptuary.
   [1913 Webster] Sybaritic

WordNet (r) 3.0 (2006):

sybarite
    n 1: a person addicted to luxury and pleasures of the senses
         [syn: voluptuary, sybarite]

Moby Thesaurus II by Grady Ward, 1.0:

19 Moby Thesaurus words for "sybarite":
   Cyrenaic, Heliogabalus, Sardanapalus, aesthete, bon vivant,
   carpet knight, epicure, epicurean, gastronome, gourmand, gourmet,
   hedonist, jet-setter, playboy, pleasure-seeker, sensualist,
   sensuist, swine, voluptuary