Exosseous is a medical term used to describe structures that are located or arise from outside the bone. Some synonyms for exosseous include periosteal, extrabone, and superficial. Periosteal refers to the connective tissue layer that covers the outer surface of bones. Extrabone describes structures such as muscles or ligaments that originate from outside the bone, while superficial means located close to the surface or on the outside of something. Other synonyms include subcutaneous, subperiosteal, and extracapsular. These words are essential in medical terminology as they help health professionals communicate effectively and accurately about patient conditions.