/ Dictionary / Index H hyperkinesia: Meaning and Definition of Find definitions for: hy•per•ki•ne•sia Pronunciation: (hī"pur-ki-nē'zhu, -zhē-u, -zē-u, -kī-), [key] — n. an abnormal amount of uncontrolled muscular action; spasm. a disorder occurring in children and adolescents, characterized by excessive activity, extreme restlessness, impulsivity, and a short attention span. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hyperkeratosis hyperlipemia Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language