— hyperkinetic /huy'peuhr ki net"ik, -kuy-/ , adj.
/huy'peuhr ki nee"zheuh, -zhee euh, -zee euh, -kuy-/ , n.
1. Pathol. an abnormal amount of uncontrolled muscular action; spasm.
2. Psychiatry. a disorder occurring in children and adolescents, characterized by excessive activity, extreme restlessness, impulsivity, and a short attention span.
Also, hyperkinesis /huy'peuhr ki nee"sis, -kuy-/ .
[ 1840-50; HYPER- + -KINESIA ]