# pion

> English word · Noun · IPA /ˈpaɪɒn/ · frequency rank #89,767

## Definitions
1. Any of three semistable mesons, having positive, negative or neutral charge, composed of up and down quarks/antiquarks.

## Etymology
From pi + -on, as alteration of pi-meson.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/pion