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Rare

mesons

The correct spelling is mesons.

How to pronounce mesons

noun

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

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Definition

noun

  1. 1.(rare outside entomology) The mesial plane dividing the body into similar right and left halves.
  2. 2.A member of a group of subatomic particles having a mass intermediate between electrons and protons. (The most easily detected mesons fit this definition.)
  3. 3.(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.)

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