Bellerophon Syllabification: (Bel·ler·o·phon)Pronunciation: /bəˈlerəˌfän, -fən/ Greek MythologyDefinition of Bellerophon a hero who slew the monster Chimera with the help of the winged horse Pegasus. Bellerophon in other Oxford dictionaries Definition of Bellerophon in the British & World English dictionary