The Collaborative International Dictionary of English v.0.48:

Bellbird \Bell"bird`\, n. [So called from their notes.] (Zool.)
   (a) A South and Central American bird of the genus
       Casmarhincos, and family Cotingid[ae], of several
       species; the campanero.
   (b) The Myzantha melanophrys of Australia.
       [1913 Webster] bell-bottomed