Shaped like an equal-sided triangle; deltate is preferred, the -oid ending being more usual for 3-dimensional shapes.
Of the shape of an equilateral triangle.
A big triangular muscle covering the shoulder joint and attached to the humerus, which lifts the arm sideways.
Triangular in shape, though commonly with rounded corners, usually with the stalk joining the blade at the center of the base.
A thick triangular muscle that covers the shoulder joint. It is responsible for raising the arm away from the side of the body.
The powerful triangular muscle attached above to the collar-bone and shoulder-blade, and below, by its point, to the humerus, nearly halfway down the outer side of the upper arm. Its action is to raise the arm from the side, and it covers and gives roundness to the shoulder.
Large, triangular muscle covering the shoulder joint that allows the arm to extend outward and to the side of the body.
The deltoid, a triangular shoulder muscle, encompasses the curved flesh on the outer side of the upper arm while traversing across and above the shoulder joint. The broader extremity of this muscle connects to both the scapula (shoulder blade) and the clavicle (collarbone). Converging muscle fibers shape the peak of the triangular structure, which attaches to the humerus (upper-arm bone) at a midsection position.
The core, most robust segment of the deltoid muscle elevates the arm laterally. The anterior and posterior sections of the muscle contribute to the rotational movement of the arm.
A shoulder muscle responsible for lifting the arm sideways and away from the body.