The Collaborative International Dictionary of English v.0.48:

Homophone \Hom"o*phone\, n. [Cf. F. homophone. See
   Homophonous.]
   1. A letter or character which expresses a like sound with
      another. --Gliddon.
      [1913 Webster]

   2. A word having the same sound as another, but differing
      from it in meaning and usually in spelling; as, all and
      awl; bare and bear; rite, write, right, and wright.
      Homophonic

WordNet (r) 3.0 (2006):

homophone
    n 1: two words are homophones if they are pronounced the same
         way but differ in meaning or spelling or both (e.g. bare
         and bear)