Source : Webster's Revised Unabridged Dictionary (1913)

Song \Song\ (?; 115), n. [AS. song, sang, fr. singan to sing;
   akin to D. zang, G. sang, Icel. s["o]ngr, Goeth. sagws. See
   {Sing}.]
   1. That which is sung or uttered with musical modulations of
      the voice, whether of a human being or of a bird, insect,
      etc. ``That most ethereal of all sounds, the song of
      crickets.'' --Hawthorne.

   2. A lyrical poem adapted to vocal music; a ballad.

   3. More generally, any poetical strain; a poem.

            The bard that first adorned our native tongue Tuned
            to his British lyre this ancient song. --Dryden.

   4. Poetical composition; poetry; verse.

            This subject for heroic song.         --Milton.

   5. An object of derision; a laughingstock.

            And now am I their song. yea, I am their byword.
                                                  --Job xxx. 9.

   6. A trifle. ``The soldier's pay is a song.'' --Silliman.

   {Old song}, a trifle; nothing of value. ``I do not intend to
      be thus put off with an old song.'' --Dr. H. More.

   {Song bird} (Zo["o]l.), any singing bird; one of the Oscines.
      

   {Song sparrow} (Zo["o]l.), a very common North American
      sparrow ({Melospiza fasciata}, or {M. melodia}) noted for
      the sweetness of its song in early spring. Its breast is
      covered with dusky brown streaks which form a blotch in
      the center.

   {Song thrush} (Zo["o]l.), a common European thrush ({Turdus
      musicus}), noted for its melodius song; -- called also
      {mavis}, {throsite}, and {thrasher}.

   Syn: Sonnet; ballad; canticle; carol; canzonet; ditty; hymn;
        descant; lay; strain; poesy; verse.

Source : WordNet®

song sparrow
     n : small songbird common in North America [syn: {Melospiza
         melodia}]