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demyelination loss of the myelin sheath surrounding nerve cells that causes impaired function, as in multiple sclerosis.
MS2 abbreviation of "multiple sclerosis," a degenerative disease of the nervous system in which nerve cells of the brain or spinal cord lose their myelin sheaths, resulting in hardening of the neural tissue, speech difficulties, and loss of muscular coordination.
multiple sclerosis a degenerative disease of the nervous system in which nerve cells of the brain or spinal cord lose their myelin sheaths, resulting in hardening of the neural tissue, speech difficulties, and loss of muscular coordination.