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Definition of rheumatoid arthritis noun from the Oxford Advanced American Dictionary

 

rheumatoid arthritis

 noun
noun
NAmE//ˌrumətɔɪd ɑrˈθraɪt̮əs//
 
[uncountable] (medical)
 
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a disease that gets worse over a period of time and causes painful swelling and permanent damage in the joints of the body, especially the fingers, wrists, feet, and ankles
See rheumatoid arthritis in the Oxford Advanced Learner's Dictionary