ballism

[ bal-iz-uh m ]
/ ˈbæl ɪz əm /

noun Pathology.

a condition characterized by twisting, shaking, and jerking motions.
Also bal·lis·mus [ba-liz-muh s] /bæˈlɪz məs/.

Origin of ballism

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