noun Physics.
a proton, neutron, or any elementary particle that decays into a set of particles that includes a proton.
Compare quark model.

1950–55; < Greek barý(s) heavy + (fermi)on

baryonic [bar-ee-on-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
baryon (ˈbærɪˌɒn)
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 ½. Baryons are either nucleons or hyperons. The baryon number is the number of baryons in a system minus the number of antibaryons
[C20: bary-, from Greek barus heavy + -on]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
baryon   (bār'ē-ŏn')  Pronunciation Key 
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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Example sentences
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.
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