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Of or relating to any of various diseases and disorders that chiefly affect the joints, tendons, ligaments, muscles, and bones and are characterized by pain, stiffness, and swelling. Rheumatoid arthritis, fibromyalgia, and gout are rheumatic diseases.
1. One who is affected by a rheumatic disease or disorder.
2. rheumatics Informal Pains caused by a rheumatic disease or disorder.
[Middle English reumatik, of rheum, from Old French reumatique, from Latin rheumaticus, suffering from rheum, from Greek rheumatikos, from rheuma, rheumat-, stream; see rheum.]
(Pathology) (functioning as singular) informal rheumatism