the god of the underworld; Hades
WordReference Random House Unabridged Dictionary of American English © 2025
Plu•to
(plo̅o̅′tō),USA pronunciation n.
- Mythology[Class. Myth.]a name given to Hades, under which he is identified by the Romans with Orcus.
- Astronomythe planet ninth in order from the sun, having an equatorial diameter of about 2100 miles (3300 km), a mean distance from the sun of 3.674 billion miles (5.914 billion km), a period of revolution of 248.53 years, and one known moon, Charon. See table under planet.
Collins Concise English Dictionary © HarperCollins Publishers::
the second-largest dwarf planet in the solar system, located in the Kuiper belt; discovered in 1930 by Clyde Tombaugh (1906–97); classified as a planet until 2006, when it was reclassified; it has five known satellites. Period of revolution around the sun: 248 years; period of axial rotation: 6.5 days; mass: 0.00218 times that of earth; diameter: 2300 km; Pluto has an elliptical orbit, its closest point to the sun is 29.7 AU and its farthest point away is 49.7 AU
to reduce (something) in status or importance to put an end to (something)
'Pluto' also found in these entries (note: many are not synonyms or translations):
Bode's law
- Charon
- Dis
- Hades
- Lowell Observatory
- Oort cloud
- Orcus
- Persephone
- Pickering
- Plutonian
- Scorpio
- Sedna
- Tombaugh
- dis
- outer planet
- planet
- planet X
- plutocrat
- plutonic
- plutonium
- solar system
- superior planet