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deltoid

Pronunciation: /ˈdɛltɔɪd/

Definition of deltoid

adjective

technical

triangular:a tree with large deltoid leaves

noun

(also deltoid muscle) a thick triangular muscle covering the shoulder joint and used for raising the arm away from the body.
each of the three parts of a deltoid muscle, attached at the front, side, and rear of the shoulder:the anterior deltoid