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Definition of: Pluto
(pl
′tō)
1. In Greek and Roman mythology, the god of the infernal regions and spouse of Persephone: identified with the Greek Hades and the Roman Dis.
2. Astron. The ninth planet of the solar system in order of distance from the sun, invisible to the naked eye: discovered 1930. See PLANET. [<L <Gk. Ploutōn]
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