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24.
1. Dwarf planet orbiting the sun once ever 250 Earth years on an eccentric orbit taking it from about 2,757 to 4,583 million miles out, or from nearly thirty to almost fifty times Earth's distance. For twenty of those years it is closer to the sun than Neptune; it was last at the closest point in 1989. Diameter, 1485 miles. Surface temperature by recent measurement 230 degrees Centigrade below freezing. Maximum air pressure is 700,000 times less than Earth's. Composition largely rock and various ices. Closely orbited by its comparatively large moon Charon (diameter 753 miles); the centre of mass of the system, around which both bodies orbit, is above Pluto's surface and both bodies are tidally locked on one another, always keeping the same faces inwards; there are at least two other moons, Nix and Hydra, discovered in 2005. Pluto rotates on its axis, and is orbited by Charon, roughly every six Earth days and nine hours. Pluto is at least five hundred times less massive than Earth (a body that many times more massive than Earth would outweigh Jupiter) and smaller than seven moons in the system, including our own Moon. Officially the ninth planet from its discovery by Clyde Tombaugh in 1930, with the discovery of several similar-sized bodies in the outer system Pluto was demoted to the newly-created dwarf planet category in 2006. Gives its name to the highly toxic synthetic element plutonium, atomic number 94.

2. Roman god of the Underworld, connected by parallel with the Greek Hades. The Roman Pluto (or more accurately Plutus) was more a divinity of the riches found under the earth such as silver and gold and hence a god of wealth, as referenced in the latter-day term plutocracy (political rule by the wealthy). Because these substances were mined from a physical underworld, Pluto is often associated as well with a spiritual underworld, or the land of the dead, hence the latter-day link to Hades.

3. Also spelt Plouto, a nymph in Greek mythology, the mother of Tantalus by Zeus. The daughter of Oceanus and Tethys.

4. Mickey Mouse's pet dog. Introduced in Disney's cartoons in 1930, the year of the dwarf planet's discovery, hence the name. A relatively naturalistic character, as opposed to the anthropomorphic dog Goofy.

5. An inbred mutant from the film franchise The Hills Have Eyes.
Pluto's next aphelion passage, or furthest swing from the sun, is in 2113.

By Pluto's grace, may Cornelius Arvensis grow filthy rich.

Pluto was flaunting herself in the River Lethe again.

Mickey could no longer control Pluto, and when Pluto smelled something interesting Mickey was pulled right up the creek on the lead.

If Mickey's a mouse and Goofy's a dog, what's Pluto?

Pluto watched intently from behind the red rock as the station wagon negotiated the rutted road.
by Fearman May 17, 2008
 
1.
Verb. to pluto someone or something is to downgrade, demote or remove altogether from a prestigious group or list, Like what was done to the planet of the same name.
he was plutoed like an old pair of shoes.
by Yoova August 24, 2006
 
2.
No longer a planet. It was discovered in the 1930s and in 2006 they finally decide to change everything we learned growing up...im so confused now...
wtf! everything i learned went out the window, pluto isn't a planet anymore.
by Dr.Mario August 24, 2006
 
3.
a big ball of methane and nitrogen that was big ballin' as a planet for about 80 years, until the IAU (International Astronomical Union) decided to get all technical and make that little bitch a "dwarf planet." At this point, it's a pretty safe bet that Pluto won't be getting laid anytime soon.
Pluto used to get invited to P Diddy parties back when he was part of the big 9, but now he can't even kick it with Polly Shore. What a a tool!
by MC Docky Dock August 24, 2006
 
4.
1. somebody who has achieved promotion quickly at work, only for it to be obvious that they cannot live up to the job, and hence experience a humiliating demotion
2. a star -rock\pop etc - who is talked about a lot in the press as though they are the next big thing, but then never deliver the goods.
After the planet - which is no longer a planet!
1. hear about Smithson - last weeks new MD? Got fired, the asshole. He's a real pluto.

2. Pete Doherty is just a total pluto
by chris firth August 24, 2006
 
5.
a poor little rock thingy in space that was tricked into thinking it was a planet, when... wham! some mean scientists told it the truth: it was a "dwarf planet" (which is some sick disorder that tiny planets are labeled with). i feel bad for the little guy.
"It's okay, Pluto. I'm not a planet either."- Snorg Tees
by Spyder Gurl August 23, 2008
 
6.
Verb: To be demoted for no good reason. Origin from the former planet Pluto.

The corporal got in trouble with the sargent, therefore, he was plutoed back to private.

by Buddy Man March 16, 2007
 
7.
Used to be the ninth planet in our solar system. Now it is categorized as a dwarf planet.
Pluto isn't a planet anymore?
by dillonleahy August 24, 2006