Etymology
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meson (n.)

subatomic particle, 1939, from Greek mesos "middle" (from PIE root *medhyo- "middle") + subatomic particle suffix -on. Earlier mesotron (1938). So called for being intermediate in mass between protons and electrons. An earlier use of the word, from the Greek noun meson "center," meant "the medial plane which divides the body into two equal and symmetrical parts" (by 1883).

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Definitions of meson

meson (n.)
an elementary particle responsible for the forces in the atomic nucleus; a hadron with a baryon number of 0;
Synonyms: mesotron
From wordnet.princeton.edu