noun Pathology.
a condition characterized by twisting, shaking, and jerking motions.
Also, ballismus [ba-liz-muhs] .

1955–60; < Neo-Latin ballismus < Greek ballismós a jumping around, dancing, equivalent to báll(ein) to throw + -ismos -ism Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

ballismus bal·lis·mus (bə-lĭz'məs)
Jerky or shaking movements of the arms or legs, especially such movements occurring in chorea.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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