noun. a large triangular muscle covering the shoulder joint and serving to abduct and flex and extend and rotate the arm.
- deltoid muscle
- skeletal muscle
- rotator cuff
- musculus deltoideus
adjective. triangular or suggesting a capital delta, with a point at the apex.
Sentences with deltoid
1. Noun, singular or mass
The anterior deltoid is at the front of your shoulder.
Because the deltoid muscle is responsible for lifting the arm straight up from the side, it may be difficult or impossible to move the arm in this way.