# deltoid muscle

> English word · Noun

## Definitions
1. A triangular muscle on the human shoulder.

## Etymology
Short for deltoideus + muscle. Previously the deltoideus muscle and musculus deltoideus.

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