from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Roman Mythology The god of the dead and the ruler of the underworld.
- n. A dwarf planet that until 2006 was classified as the ninth planet in our solar sytem, having a sidereal period of revolution about the sun of 248.5 years, 4.4 billion kilometers (2.8 billion miles) distant at perihelion and 7.4 billion kilometers (4.6 billion miles) at aphelion, and a diameter less than half that of Earth. See Usage Note at planet.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- proper n. Greek and Roman god of the underworld.
- proper n. Originally known as the ninth planet but reclassified in 2006 as a dwarf planet, the brightest and first known Kuiper belt object, represented by the symbol ♇ in astronomy and in astrology.
from the GNU version of the Collaborative International Dictionary of English
- The son of Saturn and Rhea, brother of Jupiter and Neptune; the dark and gloomy god of the Lower World.
- 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.
from The Century Dictionary and Cyclopedia
- n. In Roman mythology, the lord of the infernal regions, son of Saturn and brother of Jupiter and Neptune.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a small planet and the farthest known planet from the sun; it has the most elliptical orbit of all the planets
- n. a cartoon character created by Walt Disney
- n. (Greek mythology) the god of the underworld in ancient mythology; brother of Zeus and husband of Persephone
Latin Plūtō, Plūtōn-, from Greek Ploutōn, from ploutos, wealth (from the belief that the underworld was the source of wealth from the ground).(American Heritage® Dictionary of the English Language, Fourth Edition)
Ancient Greek Πλούτων (Plutōn) (Wiktionary)