👉 Synovial is a Latin word that translates to "joint" in English. It refers to the membrane-like tissue that surrounds and cushions the joint surfaces of the bones, muscles, tendons, ligaments, and other structures in the body. Synovial tissues are composed mostly of fat and connective tissue, with some cells found in the synovial fluid and synovial sheaths. Synovial joints are important for movement, function, and protection within the body.