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.
Venus in Aries is charging up your fourth house of home and family, while Pluto in Aquarius radically shifts your mindset around money. Valerie Mesa, People.com, 6 Feb. 2025 Unlike the major streaming platforms including Netflix, Warner Bros. Discovery’s Max or Disney’s Hulu or Disney+, services such as Tubi and Pluto are free offerings solely supported by advertising. Lillian Rizzo, CNBC, 4 Feb. 2025 Zoom in: The new deal allows Nielsen to measure all of Paramount's platforms, including its national and local broadcast channels, all of its cable networks, and its streaming platforms, Paramount+ and Pluto TV. Axios, 3 Feb. 2025 One, in my opinion, seemed backward-defined just to include Pluto. Phil Plait, Scientific American, 30 Jan. 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

Dictionary Entries Near Pluto

Cite this Entry

“Pluto.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Pluto. Accessed 11 Feb. 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

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!