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Pluto definition

Pluto (plo̵̅o̅t′ō)

noun

  1. Gr. & Rom. Myth. the god ruling over the lower world: also called Hades by the Greeks and Dis or Orcus by the Romans
  2. the smallest planet of the solar system and the ninth in average distance from the sun: diameter, c. 2,270 km (c. 1,410 mi); period of revolution, c. 248.59 earth years; period of rotation (retrograde), 6.39 earth days; one satellite; symbol, ♇

Etymology: L < Gr Ploutōn < ploutos, wealth: see plutocracy

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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