phrenesis

Noun

 * 1)  phrenitis
 * 2) madness, frenzy

Quotations

 * "Before the Armada, the Army of Flanders had experienced its share of mutinies or 'furies'--as the ravages of licentious soldiery were called when the phrenesis of indiscipline came over them" - Fernandez-Armesto, Felipe, The Spanish Armada, the Experience of War in 1588, (Oxford, 1988).

Etymology
Borrowed from, late variant of.

Noun

 * 1) madness, delirium, frenzy