# nucleon

> English word · Noun · IPA /ˈn(j)uːkliɒn/ · frequency rank #82,601

## Definitions
1. A proton (uud) or a neutron (udd).

## Etymology
From nucleus + -on.

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