deltoid: elongate triangular: resembling a Greek D with apex extended.
The part of this muscle which arises from the humerus is covered by the deltoid.
It is necessary to add that the deltoid is inserted into the humerus, above the insertion of the mastoido-humeral.
The arm is divided into three sections: the deltoid, brachial and carpal.
deltoid ridge moderately prominent, irregular, rugose, and extending to about the middle of the shaft.
A single muscle, the deltoid, in this case does most of the work.
I imagined that I could detect, at the height of my deltoid muscle, the exact spot where the sleeve of her under-garment ended.
Above this groove, and on the external surface, there exists a rough surface which is the impression of the deltoid.
Tom Sayers says Skeffy's deltoid—that's the muscle up here—is finer than any in the ring, and he's such an active devil.
But the others scornfully suggested that the deltoid was a muscle; they knew, because they had dissected one that very morning.
deltoid del·toid (děl'toid')
Of or relating to the deltoid muscle.
Triangular in shape or outline.