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Pluto

1 ENTRIES FOUND:
Pluto /ˈpluːtoʊ/ noun
Pluto
/ˈpluːtoʊ/
noun
Learner's definition of PLUTO
[singular]
: 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冥王星（曾被认为是太阳系距离太阳最远的行星，现在不再视其为行星）

Pluto

noun

Plu·​to ˈplü-(ˌ)tō How to pronounce Pluto (audio)
1
: the Greek god of the underworld compare dis
2
[New Latin] : a dwarf planet occupying an orbit that crosses the orbit of Neptune
Is Pluto a planet?: Usage Guide

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.

Word History

Etymology

Latin Pluton-, Pluto, from Greek Ploutōn

First Known Use

14th century, in the meaning defined at sense 1

Time Traveler
The first known use of Pluto was in the 14th century

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