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Any member of one of two classes of hadrons. Baryons are heavy subatomic particles made up of three quarks. They are characterized by a baryon number, B, of 1, and have half-integer spin values. Their antiparticles (seeantimatter), called antibaryons, have a baryon number of 1. Both protons and neutrons are baryons.
This entry comes from Encyclopædia Britannica Concise. For the full entry on baryon, visit Britannica.com.