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sclerosis US English

Abnormal hardening of body tissue

multiple sclerosis US English

A chronic, typically progressive disease involving damage to the sheaths of nerve cells in the brain and spinal cord, whose symptoms may include numbness, impairment of speech and of muscular coordination, blurred vision, and severe fatigue

amyotrophic lateral sclerosis US English

A progressive degeneration of the motor neurons of the central nervous system, leading to wasting of the muscles and paralysis