Pluto

(noun) a cartoon character created by Walt Disney.

(noun) (Greek mythology) the god of the underworld in ancient mythology; brother of Zeus and husband of Persephone. Synonyms: Hades, Aides, Aidoneus.

(noun) a small planet and the farthest known planet from the sun; it has the most elliptical orbit of all the planets. Example: "Pluto was discovered by clyde tombaugh in 1930."