The prefix "arthro-" refers to joints or articulations. Some common synonyms for this prefix include "articul-", "articular-", and "synovi-". "Articul-" is often used in medical terms to refer to joints, such as "articulation" for the movement of two bones at a joint. "Articular-" is used in terms like "articular cartilage," which is the smooth, flexible tissue that covers the ends of bones at a joint. "Synovi-" refers to the synovial fluid that lubricates and cushions joints. Overall, these synonyms for "arthro-" are important for understanding medical terminology related to joints.