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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).
Medical Definition of pathy. pathy: A suffix derived from the Greek pathos meaning suffering or disease that serves as a suffix in many terms including myopathy (muscle disease), neuropathy (nerve disease), retinopathopathy (disease of the retina), sympathy (literally, suffering together), etc. The corresponding prefix is patho-, as in pathobiology and pathology.