polymyositis
noun
poly·myo·si·tis
ˌpä-lē-ˌmī-ə-ˈsī-təs
: inflammation of several muscles at once
specifically
: an inflammatory muscle disease of unknown cause that affects muscles and chiefly skeletal muscles and is characterized especially by weakness of the muscles (such as those of the shoulder, neck, or hip) closest to the trunk see dermatomyositis
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Merriam-Webster unabridged
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