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me·son / ˈmezˌän; ˈmāˌzän; ˈmēˌzän/ • n. Physics a subatomic particle that is intermediate in mass between an electron and a proton and transmits the strong interaction that binds nucleons together in the atomic nucleus. DERIVATIVES: me·son·ic / meˈzänik; mā-; mē-/ adj.

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meson Subatomic particle, member of a subgroup of hadrons, all of which have either zero or integral spin. They include the pions, kaons, and eta mesons.