The Collaborative International Dictionary of English v.0.48:

Lyric \Lyr"ic\, Lyrical \Lyr"ic*al\, a. [L. lyricus, Gr. ?: cf.
   F. lyrique. See Lyre.]
   1. Of or pertaining to a lyre or harp.
      [1913 Webster]

   2. Fitted to be sung to the lyre; hence, also, appropriate
      for song; suitable for or suggestive of singing; -- of
      music or poetry.
      [1913 Webster]

   3. expressing deep personal emotion; -- said especially of
      poetry which expresses the individual emotions of the
      poet; as, the dancer's lyrical performance. "Sweet lyric
      song." --Milton.

   Syn: lyric.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

lyrical
    adj 1: suitable for or suggestive of singing
    2: expressing deep emotion; "the dancer's lyrical performance"
       [syn: lyric, lyrical]