Etymology
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pion (n.)

type of subatomic particle, 1951, from Greek letter pi + -on.

updated on June 17, 2020

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Definitions of pion from WordNet

pion (n.)
a meson involved in holding the nucleus together; produced as the result of high-energy particle collision;
Synonyms: pi-meson
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.