Pluto
noun
Plu·to
ˈplü-(ˌ)tō
1
: the Greek god of the underworld compare dis
2
[New Latin]
: a dwarf planet occupying an orbit that crosses the orbit of Neptune
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.
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Merriam-Webster unabridged
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