The term relating to BONE is 'OSTEAL', which is an adjective meaning 'of or pertaining to BONE'. It is derived from the Latin word 'osteum', which means 'BONE'. Osteology is the scientific study of bones, and osteopathy is a form of alternative medicine that focuses on the musculoskeletal system. Osteoporosis is a condition in which bones become weak and brittle due to a lack of calcium. Osteoarthritis is a degenerative joint disease that affects the cartilage and bones of the joints.