Pluto
noun
Plu·to
ˈplü-(ˌ)tō 
1
: the Greek god of the underworld compare dis
2
[New Latin]
: a dwarf planet occupying an orbit that crosses the orbit of Neptune
Is Pluto a planet?: Usage Guide
In 2006 the International Astronomical Union defined planet in such a way as to exclude Pluto, reclassifying it instead as a dwarf planet. Although discussion of the matter continues, the change has been widely accepted.
Examples of Pluto in a Sentence
Recent Examples on the Web
Three’s Company is now available to view on Pluto TV.
—
Marc Berman, Forbes, 15 Mar. 2025
The Mars Curiosity and Perseverance rovers and the New Horizons spacecraft that visited Pluto in 2015 have all used RTGs.
—Benjamin Roulston, The Conversation, 14 Mar. 2025
These include planets and thousands of asteroids, comets, icy worlds beyond Pluto, and interstellar objects that occasionally transit through the Solar System.
—Ars Technica, 13 Mar. 2025
Despite not technically being a planet anymore, Pluto has five moons.
—Laura Baisas, Popular Science, 12 Mar. 2025
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Marc Berman, Forbes, 15 Mar. 2025
The Mars Curiosity and Perseverance rovers and the New Horizons spacecraft that visited Pluto in 2015 have all used RTGs.
—Benjamin Roulston, The Conversation, 14 Mar. 2025
These include planets and thousands of asteroids, comets, icy worlds beyond Pluto, and interstellar objects that occasionally transit through the Solar System.
—Ars Technica, 13 Mar. 2025
Despite not technically being a planet anymore, Pluto has five moons.
—Laura Baisas, Popular Science, 12 Mar. 2025
See All Example Sentences for Pluto
Articles Related to Pluto
Cite this Entry
“Pluto.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Pluto. Accessed 23 Mar. 2025.
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