The Collaborative International Dictionary of English v.0.48:
Pyretic \Py*ret"ic\, a. [Gr. ? burning heat, fever, from ? fire: cf. F. pyr['e]tique.] (Med.) Of or pertaining to fever; febrile. [1913 Webster]WordNet (r) 3.0 (2006):
pyretic adj 1: causing fever [ant: antipyretic]