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ballism

American  
[bal-iz-uhm] / ˈbæl ɪz əm /
Also ballismus

noun

Pathology.
  1. a condition characterized by twisting, shaking, and jerking motions.

  2. Parkinson's disease.


Etymology

Origin of ballism

1955–60; < New Latin ballismus < Greek ballismós a jumping around, dancing, equivalent to báll ( ein ) to throw + -ismos -ism