osteoarthritis
Syllabification: (os·te·o·ar·thri·tis)
Pronunciation: /ˌästēōärˈTHrītis/
Definition of osteoarthritis
noun
Medicine- degeneration of joint cartilage and the underlying bone, most common from middle age onward. It causes pain and stiffness, especially in the hip, knee, and thumb joints. Compare with rheumatoid arthritis.