meson

/หˆmษ›s.ษ’n/
noun
  1. 1

    (rare outside entomology) The mesial plane dividing the body into similar right and left halves.

noun
  1. 1

    A member of a group of subatomic particles having a mass intermediate between electrons and protons. (The most easily detected mesons fit this definition.)

  2. 2

    (now specifically) An elementary particle that is composed of a quark and an antiquark, such as a kaon or pion. (Mesons composed of rarer quarks are much heavier.)

Synonyms

mesotron

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Source: https://en.wiktionary.org/wiki/meson

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