Pluto

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noun Plu·to \ˈplü-(ˌ)tō\

Definition of Pluto

  1. 1 :  the Greek god of the underworld — compare dis

  2. 2 [New Latin] :  a dwarf planet occupying an orbit that crosses the orbit of Neptune

Is pluto a planet?

In 2006 the International Astronomical Union defined planet in such a way as to exclude Pluto, reclassifying it instead as a dwarf planet. Although discussion of the matter continues, the change has been widely accepted.

Origin and Etymology of pluto

Latin Pluton-, Pluto, from Greek Ploutōn


First Known Use: 14th century


PLUTO Defined for English Language Learners

Pluto

play
noun Plu·to \ˈplü-(ˌ)tō\

Definition of Pluto for English Language Learners

  • : the object in our solar system that in the past was thought to be the planet farthest from the sun but that is no longer considered to be a planet



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