Dancing Mania, an epidemic of frequent occurrence, especially in German towns, during the Middle Ages, of the nature of hysteria, showing itself in convulsive movements beyond the control of the will, and in delirious acts, sometimes violently suicidal; the most signal occurrence of the mania was at Aix-la-Chapelle in July 1374.
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Dance of Death * Dancourt, Florent Carton