1Greek Mythology An old man who ferried the souls of the dead across the Styx and Acheron Rivers to Hades.
2Astronomy The largest satellite of Pluto, discovered in 1978, with a diameter (1,190 km) that is more than half that of Pluto.
2Astronomy The largest satellite of Pluto, discovered in 1978. Its diameter of 789 miles (1,270 km) is more than half that of Pluto.
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