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Definition of Pluto


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Pluˇto  audio  (plt) KEY  

NOUN:
  1. Roman Mythology The god of the dead and the ruler of the underworld.
  2. 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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The American Heritage® Dictionary of the English Language, Fourth Edition.
Copyright © 2000 by Houghton Mifflin Company.
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