Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Any of a class of subatomic particles that are both hadrons and bosons, are composed of a quark and an antiquark, participate in strong interactions, and have masses generally intermediate between those of leptons and baryons.

from The Century Dictionary.

  • noun The median plane which divides a body into two equal and symmetrical parts; the vertical longitudinal middle plane, dividing the body into right and left halves.
  • noun See tetrachord.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Anat.) The mesial plane dividing the body of an animal into similar right and left halves. The line in which it meets the dorsal surface has been called the dorsimeson, and the corresponding ventral edge the ventrimeson.
  • noun (Physics) An elementary particle made up of two quarks; a hadron having a baryon number of zero; any hadron other than a baryon. Mesons are bosons with integral values of spin, having a mass intermediate between those of the electron and a nucleon; they may have positive or negative charges, or may be neutral. Mesons are of three types: the pion (π-meson), kaon (K-mesons), and η-mesons.
  • noun (Physics) the former name for the muon, a particle which is not a true meson{2}. The term is no longer used in technical literature, except historically.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun The mesial plane dividing the body into similar right and left halves.
  • noun 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.)
  • noun now specifically, physics 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.)

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun an elementary particle responsible for the forces in the atomic nucleus; a hadron with a baryon number of 0

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[meso– + –on.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Ancient Greek μέσον (méson, "middle").

from Wiktionary, Creative Commons Attribution/Share-Alike License

From meso- +‎ on.

Examples

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