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[bar-ee-on] /ˈbær iˌɒn/
noun, Physics.
a proton, neutron, or any elementary particle that decays into a set of particles that includes a proton.
Compare quark model.
Origin of baryon
1950-55; < Greek barý(s) heavy + (fermi)on
Related forms
[bar-ee-on-ik] /ˌbær iˈɒn ɪk/ (Show IPA),
adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for baryon
  • The proton is a baryon that consists of two up and one down quark, and the neutron is two down and one up.
  • When a baryon cloud collapses, the particles interact, converting some of the kinetic energy into light and heat.
  • If you know of a possible reason the landscape implies baryon number conservation, let's hear it.
  • In other words, the total baryon and lepton number of the reactants must equal the total baryon and lepton number of the products.
  • baryon oscillation as a ruler to measure the universe.
  • The baryon density is also constrained by the nucleosynthesis models of the early universe.
  • Hydrodynamic expansion entropy, baryon number conservation.
British Dictionary definitions for baryon


any of a class of elementary particles that have a mass greater than or equal to that of the proton, participate in strong interactions, and have a spin of 1/2. Baryons are either nucleons or hyperons. The baryon number is the number of baryons in a system minus the number of antibaryons
Word Origin
C20: bary-, from Greek barus heavy + -on
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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baryon in Science
Any of a family of subatomic particles composed of three quarks or three antiquarks. They are generally more massive than mesons, and interact with each other via the strong force. Baryons form a subclass of hadrons and are subdivided into nucleons and hyperons. Protons and neutrons are baryons. See Table at subatomic particle.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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