Definition of Pluto

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< Plutarch

plutocracy >

Plu·to

(pl

) KEY

NOUN:

Roman Mythology The god of the dead and the ruler of the underworld.
The ninth and usually farthest planet from the sun, having a sidereal period of revolution about the sun of 248.5 years, 4.4 billion kilometers (2.8 billion miles) distant at perihelion and 7.4 billion kilometers (4.6 billion miles) at aphelion, and a diameter less than half that of Earth.

ETYMOLOGY:
Latin Plt, Pltn-, from Greek Ploutn, from ploutos, wealth (from the belief that the underworld was the source of wealth from the ground); see pleu- in Indo-European roots

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