[hahy-per-ki-nee-zhuh, -zhee-uh, -zee-uh, -kahy-]
Pathology. an abnormal amount of uncontrolled muscular action; spasm.
Psychiatry. a disorder occurring in children and adolescents, characterized by excessive activity, extreme restlessness, impulsivity, and a short attention span.
Also, hyperkinesis [hahy-per-ki-nee-sis, -kahy-] .

1840–50; hyper- + -kinesia

hyperkinetic [hahy-per-ki-net-ik, -kahy-] , adjective
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World English Dictionary
hyperkinesia or hyperkinesis (ˌhaɪpəkɪˈniːzɪə, -kaɪ-, ˌhaɪpəkɪˈniːsɪs, -kaɪ-)
1.  excessive movement, as in a muscle spasm
2.  extreme overactivity in children
[C20: from hyper- + -kinesia from Greek kinēsis movement, from kinein to move]
hyperkinesis or hyperkinesis
[C20: from hyper- + -kinesia from Greek kinēsis movement, from kinein to move]
hyperkinetic or hyperkinesis

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

hyperkinesia hy·per·ki·ne·sia (hī'pər-kə-nē'zhə, -kī-) or hy·per·ki·ne·sis (-sĭs)
Pathologically increased muscular movement.

hy'per·ki·net'ic (-nět'ĭk) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica


in dogs, a disorder in which muscle spasms are prominent. It is usually associated with distemper, encephalitis, or other diseases and often appears during the convalescent period. Jaw spasms may interfere with eating, and extreme exhaustion follows severe episodes in which the dog cannot sleep. Treatment involves good nutrition, vitamin supplements, and sedation. Antispasmodic drugs and muscle relaxants are used to relieve the symptoms.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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