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Definition of POLYMYOSITIS
: inflammation of several muscles at once; specifically: an inflammatory muscle disease of unknown cause that affects skeletal muscles chiefly closest to the trunk and is characterized especially by muscle weakness and muscle and joint pain
First Known Use of POLYMYOSITIS
Medical Definition of POLYMYOSITIS
: inflammation of several muscles at once; specifically: an inflammatory disease of unknown cause that affects muscles and especially skeletal muscles, is characterized typically by weakness usually of the proximal muscles (as of the pectoral or pelvic girdles or of the neck), muscle and joint pain, pathological muscle changes (as fiber degeneration or infiltration by lymphocytes), pneumonia, and cardiac abnormalities (as arrhythmia or myocarditis)—see dermatomyositis