Pion Definition
pīŏn
pions
noun
pions
Any of three short-lived mesons that may be positive, negative, or neutral: pions have a mass c. 270 times that of an electron and play an important role in the binding forces within the nucleus of an atom.
Webster's New World
Synonyms:
Other Word Forms of Pion
Noun
Singular:
pion
Plural:
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