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Word: meson
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Meaning:
Noun:
- now specifically|particles An elementary particle that is composed of a quark and an antiquark, such as a kaon or pion. (Meson composed of rarer quarks are much heavier.)
- rare|_|except|_|entomology The mesial plane dividing the body into similar right and left halves.
- obsolete A member of a group of subatomic particles having a mass intermediate between electrons and protons. (The most easily detected mesons fit this definition.)
Source: Wiktionary
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