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Myopathy is a disease of muscle in which the muscle fibers do not function properly. This results in muscular weakness. Myopathy simply means muscle disease (Greek myo- muscle + patheia < -pathy suffering). This meaning implies that the primary defect is within the muscle, as opposed to the nerves (neuropathies or neurogenic disorders) or elsewhere (e.g., the brain).
Pathy is defined as a feeling or suffering, a disease or the treatment for a disease. An example of pathy as a suffix is apathy, which is the lack of feeling. An example of pathy as a suffix is myopathy, which is the disease of a muscle. An example of pathy as a suffix is homeopathy, which is a natural medical treatment.