# deltoid

> English word · Noun · IPA /ˈdɛɫtɔɪd/ · frequency rank #81,260

## Definitions
1. The deltoid muscle, a triangular muscle on the human shoulder.
2. The deltoid ligament, a triangular ligament on the human ankle.
3. A kite (quadrilateral having two pairs of edges of equal length, the edges of each pair touching each other at one end).
4. A deltoid curve (hypocycloid with three cusps).

## Etymology
From Latin deltoideus, which was in turn from Ancient Greek adjective δελτοειδής (deltoeidḗs). See also: δέλτα (délta), the fourth letter of the Greek alphabet.

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