pion

Noun

pi=on

WORDNET DICTIONARY

pion(n = noun.object) pi-meson - a meson involved in holding the nucleus together; produced as the result of high-energy particle collision;

is a kind of meson, mesotron

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