Definitions

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

  • n. Any of a family of subatomic particles, including the nucleon and hyperon multiplets, that participate in strong interactions, are composed of three quarks, and are generally more massive than mesons. Also called heavy particle. See Table at subatomic particle.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. 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 the GNU version of the Collaborative International Dictionary of English

  • n. 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 WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. 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

Greek barus, heavy; see gwerə-1 in Indo-European roots + -on1.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek βαρύς (barus, "heavy") +‎ -on (Wiktionary)

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