n. 1. A syndrome characterized by tremor, muscular rigidity, slowness of movement, and postural and balance abnormalities, caused by Parkinson's disease or other diseases or induced by trauma, infection, or a drug. Also called Parkinson's syndrome. 2. Parkinson's disease. [From PARKINSON'S DISEASE.] par′kin·soni·an (-sōnē-ən) adj. |
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.