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hemi·bal·lis·mus .hem-i-ba-'liz-məs also hemi·bal·lism -'bal-iz-əm n violent uncontrollable movements of one lateral half of the body usu. due to a lesion in the subthalamic nucleus of the contralateral side of the body
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n.
a violent involuntary movement usually restricted to one arm and primarily involving the proximal muscles. It is a symptom of disease of the basal ganglia.
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hemi·bal·lis·mus (hem″e-bə-lizґməs) [hemi- + ballismus] a violent form of dyskinesia involving only one side of the body and being most marked in the upper extremity, resulting from a destructive lesion of the nucleus subthalamicus (Luys body). Cf. hemichorea. Called also body of Luys syndrome.Medical dictionary. 2011.