bary·​on | \ ˈber-ē-ˌän How to pronounce baryon (audio) , ˈba-rē-\

Definition of baryon

: any of a group of subatomic particles (such as nucleons) that are subject to the strong force and are composed of three quarks

Keep scrolling for more

Other Words from baryon

baryonic \ ˌber-​ē-​ˈä-​nik How to pronounce baryonic (audio) , ˌba-​rē-​ \ adjective

Examples of baryon in a Sentence

Recent Examples on the Web

The heavier pentaquarks have masses just below the sum of the same baryon and a related meson with extra internal energy. Adrian Cho, Science | AAAS, "Exotic particles called pentaquarks may be less weird than previously thought," 5 June 2019 In other words, the ratio of baryons, which include protons and neutrons, to photons, which light is made of, would have to shrink. Charles Q. Choi,, "Why Alternate Universes Might Also Host Life Around their Stars," 26 Sep. 2018 Dark matter makes up about 27 percent of the universe, but scientists know little about it except that it’s not made of normal matter particles called baryons. Washington Post, "Astronomers glimpse cosmic dawn, when the stars switched on," 28 Feb. 2018 But by corralling huge numbers of baryons together, the people behind Super-Kamiokande hoped to spot one decaying much sooner, in just a few years. The Economist, "Particle physicsFundamental physics is frustrating physicists," 13 Jan. 2018 Magazines, screens, and air are made of atoms, and atoms are largely made of protons and neutrons – which are the most familiar examples of the three-quark bundles that physicists call baryons. Charlie Wood, The Christian Science Monitor, "Fusion breakthrough explained: What are quarks again?," 11 Dec. 2017 Using observatories that can see ultraviolet radiation, like the Hubble Space Telescope, astronomers have spotted enough WHIM to account for about 50% to 70% of the missing baryons—still leaving a significant fraction unaccounted for. Adam Mann, Science | AAAS, "Astronomers say they’ve found many of the universe’s missing atoms," 10 Oct. 2017 The most famous baryons are protons and neutrons, which make up everyday matter. Fox News, "‘Charming’ heavy particle discovered at world’s largest atom smasher," 11 July 2017 In the natural world, baryons have at most one heavy quark. Seth Borenstein, The Seattle Times, "Physicists find new particle with a double dose of charm," 6 July 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'baryon.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of baryon

1953, in the meaning defined above

History and Etymology for baryon

Greek barýs "heavy" + -on entry 2 — more at grieve

Keep scrolling for more

Learn More about baryon

Statistics for baryon

Last Updated

18 Jun 2019

Look-up Popularity

Time Traveler for baryon

The first known use of baryon was in 1953

See more words from the same year

More from Merriam-Webster on baryon

Rhyming Dictionary: Words that rhyme with baryon Encyclopedia article about baryon

Comments on baryon

What made you want to look up baryon? Please tell us where you read or heard it (including the quote, if possible).


incapable of being surmounted or overcome

Get Word of the Day daily email!

Test Your Vocabulary

Words for Summer: A Quiz

  • a closeup of a sunflower
  • Which of the following words means “of or relating to summer”?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

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