Source : Webster's Revised Unabridged Dictionary (1913)

Chatterer \Chat"ter*er\, n.
   1. A prater; an idle talker.

   2. (Zo["o]l.) A bird of the family {Ampelid[ae]} -- so called
      from its monotonous note. The {Bohemion chatterer}
      ({Ampelis garrulus}) inhabits the arctic regions of both
      continents. In America the {cedar bird} is a more common
      species. See {Bohemian chatterer}, and {Cedar bird}.

Source : WordNet®

chatterer
     n 1: an obnoxious and foolish and loquacious talker [syn: {babbler},
           {prater}, {chatterbox}, {magpie}, {spouter}]
     2: passerine bird of New World tropics [syn: {cotinga}]