Definitions

1. adjective

Relating to the deltoid muscle, which is a muscle of the shoulder that has a triangle-shaped (delta-like) structure.

“The deltoidus muscle was identified as a key factor in the movement of the arm.”

2. noun

A muscle of the shoulder that has a triangle-shaped (delta-like) structure.

“The deltoidus muscle played a crucial role in the movement of the arm during the exercise.”