hemiballismus

noun
hemi·bal·lis·mus | \ ˌhem-i-ba-ˈliz-məs \
variants: also hemiballism \-ˈbal-iz-əm \

Medical Definition of hemiballismus 

: violent uncontrollable movements of one lateral half of the body usually due to a lesion in the subthalamic nucleus of the contralateral side of the body

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occurring twice a year or every two years

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