/ ɑːˈθraɪtɪs; NAmE ɑːrˈθ-/ noun
[ U ] a disease that causes pain and swelling in one or more joints of the body
—see also osteoarthritis , rheumatoid arthritis
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WORD ORIGIN
mid 16th cent.: via Latin from Greek , from arthron joint. Arthritic was already used in late Middle English .