Pluto

noun

Plu·​to ˈplü-(ˌ)tō How to pronounce Pluto (audio)
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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
That same day, Venus will clash with Pluto retrograde, creating tensions both romantically and regarding financial themes in your relationships. Valerie Mesa, People.com, 6 June 2025 The pre-show is exclusively on Pluto TV, a free streaming television service. Maureen Lee Lenker, EW.com, 6 June 2025 Oscar-winning filmmaker Sean Baker — who did a Times interview from the Gardena last year and appeared there again just last weekend — has partnered with Pluto TV to support their program. Mark Olsen, Los Angeles Times, 6 June 2025 The Old Navy x Disney collection includes denim, T-shirts, swimwear and accessories and features Mickey Mouse, Minnie Mouse, Goofy, Pluto and Donald Duck. David Moin, Footwear News, 5 June 2025 See All Example Sentences for Pluto

Word History

Etymology

Latin Pluton-, Pluto, from Greek Ploutōn

First Known Use

14th century, in the meaning defined at sense 1

Time Traveler
The first known use of Pluto was in the 14th century

Browse Nearby Words

Cite this Entry

“Pluto.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Pluto. Accessed 10 Jun. 2025.

Kids Definition

Pluto

noun
Plu·​to ˈplüt-ō How to pronounce Pluto (audio)
: a large object in the outermost part of the solar system that is often considered one of the planets see note at planet

More from Merriam-Webster on Pluto

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