Definition of kaon
: an unstable meson that occurs in both charged and neutral forms and is about 970 times more massive than an electron
From the M-W Editors
Recent Examples of kaon from the Web
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The most famous of these two-quark particles are kaons and pions.
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Origin and Etymology of kaon
International Scientific Vocabulary ka kay (from K-meson, its earlier name) + 2-on
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