The class of subatomic particles in which protons and neutrons are included. The baryons form the atomic nucleus, along with another class of particles - the mesons. We, and everything we can see around us, are made of baryonic matter.
Elementary particles belonging to a type of fermions that includes the nucleons, hyperons, delta particles, and others. Each baryon is associated with a baryon number of one, which is a quantity conserved in all nuclear reactions.