Bedeutung von “Pluto” — Learner’s Dictionary

Pluto

noun [ no plural ] us uk /ˈpluːtəʊ/

a dwarf planet (= an object in space like a small planet) that comes after Neptune in distance from the sun. Pluto was considered to be a proper planet until 2006, when it was officially decided that it was a dwarf planet.

(Definition von “Pluto” aus dem Cambridge Learner's Dictionary © Cambridge University Press)