English

Definition of Pluto noun from the Oxford Advanced Learner's Dictionary

 

Pluto

 noun
noun
BrE BrE//ˈpluːtəʊ//
 
; NAmE NAmE//ˈpluːtoʊ//
 
 
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one of a number of round objects in space that are not as large as planets but which go around the sun. In August 2006, the International Astronomical Union declared that Pluto should be called a dwarf planet because it is smaller and has different characteristics from the other planets in our solar system; in 2008 it declared that dwarf planets further from the sun than Neptune could also be called plutoids. Word Originvia Latin from Ploutōn, the Greek name of the god of the underworld.
See the Oxford Advanced American Dictionary entry: Pluto