関節リウマチ
Rheumatoid arthritis is derived from the Greek word "ῥεύμα-rheuma (nom.), ῥεύματος-rheumatos (gen.)" ("flow, current"). The suffix -"oid" ("resembling") gives the translation as "joint inflammation that resembles rheumatic fever". Rhuma which means watery discharge might refer to the fact that the joints are swollen or that the disease may be made worse by wet weather.