rheumatoid adjective. ['ru:mǝtɔɪd] M19.
[from RHEUMATISM + -OID.]
Resembling rheumatism; spec. in rheumatoid arthritis, rheumatoid disease, a chronic inflammatory disease characterized by changes in the synovial membranes etc., and resulting in painful deformity and immobility of the joints; of, pertaining to, or affected by this disease.
rheumatoid factor any of a group of auto-antibodies which are present in the blood of people with rheumatoid arthritis.

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