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Par′kin•son's disease`(ˈpɑr kɪn səns)
a neurologic disease believed to be caused by deterioration of the brain cells that produce dopamine, occurring primarily after the age of 60, and characterized by tremors, esp. of the fingers and hands, muscle rigidity, and a shuffling gait. Also called par′kin•son•ism (-səˌnɪz əm)
[1870–75; after James Parkinson (1755–1824), English physician who first described it]