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|Noun||1.||deltoid muscle - a large triangular muscle covering the shoulder joint and serving to abduct and flex and extend and rotate the arm|
skeletal muscle, striated muscle - a muscle that is connected at either or both ends to a bone and so move parts of the skeleton; a muscle that is characterized by transverse stripes
rotator cuff - a supporting structure of the shoulder consisting of the muscles and tendons that attach the arm to the shoulder joint and enable the arm to move