Source : Webster's Revised Unabridged Dictionary (1913)

Bellbird \Bell"bird`\, n. [So called from their notes.]
   (Zo["o]l.)
   (a) A South American bird of the genus {Casmarhincos}, and
       family {Cotingid[ae]}, of several species; the campanero.
   (b) The {Myzantha melanophrys} of Australia.

Source : WordNet®

bellbird
     n : any of several tropical American birds of the genus Procnias
         having a bell-like call