meson noun³. ['mi:zɒn, 'mɛzɒn] M20.
[from MESO- + -ON.]
Particle Physics. Orig., any of a group of subatomic particles intermediate in mass between an electron and a proton. Now spec. any such particle that has zero or integral spin and can take part in the strong interaction.
mu-meson, omega meson, phi meson, etc.

Comb.:
meson factory colloq. an establishment with a high-energy accelerator etc. for producing and experimenting with an intense beam of mesons.

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meson noun¹. [me'sɒn] E19.
[Spanish mesón.]
An inn or lodging-house in Mexico or the south-western US.

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meson noun². ['mɛsɒn] L19.
[Use as noun of neut. of Greek mesos middle.]
Anatomy. The median plane, which divides a body into two roughly symmetrical halves.

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