Etymology
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athetosis (n.)

"condition in which the extremities perform slow, involuntary motions" (a form of childhood cerebral palsy), 1871, with -osis + Greek athetos "not fixed, without position or place, set aside." Coined by U.S. nerve specialist William Alexander Hammond.

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Definitions of athetosis

athetosis (n.)
a continuous succession of slow, writhing, involuntary movements of the hands and feet and other body parts;
From wordnet.princeton.edu