Source : Webster's Revised Unabridged Dictionary (1913)

Bellerophon \Bel*ler"o*phon\, n. (Paleon.)
   A genus of fossil univalve shells, believed to belong to the
   Heteropoda, peculiar to the Paleozoic age.

Source : WordNet®

Bellerophon
     n : (Greek mythology) a mythical hero of Corinth who performed
         miracles on the winged horse Pegasus (especially killing
         the monster Chimera)