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Parkinsonism Par·kin·son·ism or par·kin·son·ism (pär'kĭn-sə-nĭz'əm)
Any of a group of nervous disorders similar to Parkinson's disease, marked by muscular rigidity, tremor, and impaired motor control and often having a specific cause, such as the use of certain drugs or frequent exposure to toxic chemicals. Also called Parkinson's syndrome.