polymyositis
poly·myo·si·tis
noun \ˌpä-lē-ˌmī-ə-ˈsī-təs\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
1878
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