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[mee-zon, ‐son, mez-on, mes‐] /ˈmi zɒn, ‐sɒn, ˈmɛz ɒn, ˈmɛs‐/
Physics. any hadron, or strongly interacting particle, other than a baryon. Mesons are bosons, having spins of 0, 1, 2, …, and, unlike baryons, do not obey a conservation law.
Compare quark model.
Origin of meson
1935-40; mes- + on1; cf. mesotron
Related forms
mesonic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for meson
Historical Examples
  • What about de Selva's place, the Radziwill hacienda, the meson house?

    When the Owl Cries Paul Bartlett
  • As it was now darkening we hurried to the meson of the village.

    In Indian Mexico (1908) Frederick Starr
  • The cottage has left no trace behind, the walls of the meson are a mass of ruins, and the courtyard deserted.

  • Further studies of the interactions of π mesons are made in the meson cave.

    LRL Accelerators Lawrence Radiation Laboratory
  • Skinny told me, but it was something about meson flow and stuff like that that I didn't understand.

  • At the meson we found real rooms and true beds, and decided to stay for the night.

    In Indian Mexico (1908) Frederick Starr
  • At half past eight we reached San Carlos, a mean town with no meson or other regular stopping-place.

    In Indian Mexico (1908) Frederick Starr
  • We found shelter at a sort of a meson, where we could get no supper until nine, or possibly till ten.

    In Indian Mexico (1908) Frederick Starr
  • This meson beam then travels through a hole in the concrete shielding wall into the meson cave.

    LRL Accelerators Lawrence Radiation Laboratory
  • The cura had gone to bed; the meson had no room for us and no food for our horses; our case seemed desperate.

    In Indian Mexico (1908) Frederick Starr
British Dictionary definitions for meson


any of a group of elementary particles, such as a pion or kaon, that usually has a rest mass between those of an electron and a proton, and an integral spin. They are responsible for the force between nucleons in the atomic nucleus Former name mesotron See also muon
Derived Forms
mesonic, mesic, adjective
Word Origin
C20: from meso- + -on
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for meson

subatomic particle, 1939, from Greek mesos "middle" (see medial (adj.)) + subatomic particle suffix -on. Earlier mesotron (1938). So called for being intermediate in mass between protons and electrons.

Online Etymology Dictionary, © 2010 Douglas Harper
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meson in Science
  (měz'ŏn', měs'-, mē'zŏn', -sŏn')   
Any of a family of subatomic particles that are composed of a quark and an antiquark. Their masses are generally intermediate between leptons and baryons, and they can have positive, negative, or neutral charge. Mesons form a subclass of hadrons and include the kaon, pion and J/psi particles. Mesons were originally believed to be the particles that mediated the strong nuclear force, but it has since been shown that the gluon mediates this force. See Table at subatomic particle.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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meson in Culture
meson [(mez-on, may-zon)]

An elementary particle in the atomic nucleus.

The New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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