acromioclavicular joint

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acromioclavicular joint (plural acromioclavicular joints)

  1. (anatomy) A joint at the top of the shoulder, the junction between the acromion and the clavicle.
    • 2007 September 11, John Branch, “Eli Manning Could Sit Out Against Packers”, in New York Times[1]:
      He waved them up and down to show that his throwing shoulder still operates despite a sprained acromioclavicular joint, or AC joint.