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The term that specifically refers to a joint is "arthr-." This prefix is derived from the Greek word "arthron," which means joint. It is commonly used in medical terminology to describe conditions, procedures, or studies related to joints. For instance, "arthritis" refers to the inflammation of the joints, and "arthroscopy" is a minimally invasive surgical procedure used to examine and treat joint issues.

In contrast, "chondro-" pertains to cartilage, the flexible connective tissue found in joints but not the joint itself. "Osteo-" refers to bone, which is the hard structure that makes up the skeleton, and "myo-" relates to muscle. Each of these prefixes highlights a different aspect of the body's anatomy, but "arthr-" is distinct in its exclusive focus on joints.