osteoarthritis
noun [ U ] uk/ˌɒs.ti.əʊ.ɑːˈθraɪ.tɪs/ us/ˌɑː.sti.oʊ.ɑːrˈθraɪ.t̬əs/
骨关节炎
a disease that causes pain and stiffness in the joints (= places where two bones are connected)
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