Source : Webster's Revised Unabridged Dictionary (1913)

Antipyresis \An`ti*py*re"sis\, n. [NL., fr. Gr. ? against + ? to
   be feverish, fr. ? fire.] (Med.)
   The condition or state of being free from fever.

Source : WordNet®

antipyresis
     n : medication with antipyretics to treat a fever