CharonPronunciation: /ˈkɛːrən/Definition of Charon 1 Greek Mythology an old man who ferried the souls of the dead across the Rivers Styx and Acheron to Hades. 2 Astronomy the largest satellite of Pluto, discovered in 1978, with a diameter (1,190 km) that is more than half that of Pluto. Charon in other Oxford dictionaries Definition of Charon in the US English dictionary