kaon /kāˈon/ (physics)

One of several types of subatomic particle of smaller mass than a proton (see meson)

meson /mēˈzon or mesˈon/

A short-lived subatomic particle of smaller mass than a proton (η-mesons, π-mesons (also called pīˈons), and κ-mesons, k-mesons (also called kāˈons))

mesˈic or mesonˈic adjective

mesˈotron noun (after electron; obsolete)

Formerly a meson

mesic atom or mesonic atom noun

A nucleus with an orbital meson

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