Rheumatoid arthritis definition - Arthritis and Arthritic ...Rheumatoid arthritis: An autoimmune disease which causes chronic inflammation of the joints, the tissue around the joints, as well as other organs in the body.rheumatoid arthritis - definition of rheumatoid arthritis in the ...Rheumatoid Arthritis Definition. Rheumatoid arthritis (RA) is a chronic autoimmune disease that causes inflammation and deformity of the joints.Definition of Rheumatoid Arthritis | eHow.comRheumatoid Arthritis is characterized by a chronic inflammation of the joints. It is an auto-immune disease that can also affect the tissue surrounding the joints as ...