rotator cuff
— Noun
– English
～ 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
rotatory joint
— Noun
– English
～ a freely moving joint in which movement is limited to rotation; "the articulation of the radius and ulna in the arm is a pivot joint"
rotatory
— Adjective
– English
～ of or relating to or characteristic or causing an axial or orbital turn