rheumatoid arthritis
noun [ U ] uk/ˌruː.mə.tɔɪd ɑːˈθraɪ.tɪs/ us/ˌruː.mə.tɔɪd ɑːrˈθraɪ.t̬əs/
类风湿性关节炎
a disease that causes stiffness, swelling, and pain in the joints (= places where two bones are connected) of the body
Compare: rheumatism