osteoarthritis

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os·te·o·ar·thri·tis / ˌästēōärˈ[unvoicedth]rītis/ • n. Med. degeneration of joint cartilage and the underlying bone, most common from middle age onward. It causes pain and stiffness, esp. in the hip, knee, and thumb joints. Compare with rheumatoid arthritis.DERIVATIVES: os·te·o·ar·thrit·ic / -ˈ[unvoicedth]ritik/ adj.

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