| 1. | (Class. Myth.) The son of Saturn and Rhea, brother of Jupiter and Neptune; the dark and gloomy god of the Lower World. | ||||
| 2. | The ninth planet of the Solar System, the smallest (5700 km radius) and most distant from the sun. The suggestion has been made that it more closely resembles a large close comet than a planet. Its orbit has an eccentricity of 0.248, larger than that of any other planet; it varies from 4.44 to 7.37 billion km distance from the sun. Pluto is an oddball among its eight sister planets. It's the smallest in both size and mass, and has the most elliptical orbit. It moves in a plane tilted markedly away from the other planets' orbits. Moreover, Pluto is the only planet made almost entirely of ice.
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| Noun | 1. | Pluto - a cartoon character created by Walt Disney |
| 2. | Pluto - (Greek mythology) the god of the underworld in ancient mythology; brother of Zeus and husband of Persephone | |
| 3. | Pluto - the second smallest planet and the farthest known from the sun; has the most elliptical orbit of all the planets |
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