Arthritis \Ar*thri"tis\ ([aum]r*thr[imac]"t[i^]s), n. [L., fr. Gr. 'arqri^tis (as if fem. of 'arqri`tis belonging to the joints, sc. no`sos disease) gout, fr. 'a`rqron a joint.] (Med.) Any inflammation of the joints, including the gout. A variety of forms of arthritis are recognized, some of which (such as {rheumatoid arthritis}, also called {arthritis deformans} and {arthritis nodosa}) are chronic and progressive, and lead to incapacitation and deformity. [1913 Webster +PJC]