pion

 : 
Noun
 : 
pi=on

WORDNET DICTIONARY

Noun pion has 1 sense

OXFORD DICTIONARY

pion, n. Physics a meson having a mass approximately 270 times that of an electron. Also called pi meson (see PI(1)).

Derivative
pionic adj.
Etymology
PI(1) (the letter used as a symbol for the particle) + -ON

For further exploring for "pion" in Webster Dictionary Online


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