The Collaborative International Dictionary of English v.0.48:

Faun \Faun\, n. [L. Faunus, fr. favere to be favorable. See
   Favor.] (Rom. Myth.)
   A god of fields and shepherds, diddering little from the
   satyr. The fauns are usually represented as half goat and
   half man.
   [1913 Webster]

         Satyr or Faun, or Sylvan.                --Milton.
   [1913 Webster]

WordNet (r) 3.0 (2006):

faun
    n 1: ancient Italian deity in human shape, with horns, pointed
         ears and a goat's tail; equivalent to Greek satyr

Moby Thesaurus II by Grady Ward, 1.0:

18 Moby Thesaurus words for "faun":
   Cailleac, Faunus, Pan, Priapus, Vidar, Vitharr, corn spirit,
   fertility god, field spirit, forest god, panisc, panisca, paniscus,
   satyr, silenus, sylvan deity, the goat god, vegetation spirit