Pluto
From Longman Dictionary of Contemporary EnglishRelated topics: AstronomyPlutoPlu‧to /ˈpluːtəʊ $ -toʊ/ noun HAan object that goes around the Sun, usually beyond Neptune, which was called a planet until 2006 the discovery of Pluto in 1930Examples from the CorpusPluto• Added to this came the discovery of yet another planet - Pluto - in 1932.