Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Any of a class of subatomic particles that are both hadrons and fermions, are composed of three quarks, participate in strong interactions, and are generally more massive than mesons and leptons. The class of baryons is divided into the nucleons and hyperons.

from the GNU version of the Collaborative International Dictionary of English.

  • noun any of the elementary particles having a mass equal to or greater than that of a proton and that participate in strong interactions; a hadron with a baryon number of +1.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun physics A heavy subatomic particle created by the binding of quarks by gluons; a hadron containing three quarks. Baryons have half-odd integral spin and are thus fermions. This category includes the common proton and neutron of the atomic nucleus.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun any of the elementary particles having a mass equal to or greater than that of a proton and that participate in strong interactions; a hadron with a baryon number of +1

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Greek barus, heavy; see gwerə- in Indo-European roots + –on.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Ancient Greek βαρύς (barus, "heavy") +‎ -on

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