pyretic

from WordNet (r) 3.0 (2006)

pyretic
    adj 1: causing fever [ant: {antipyretic}]

from 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]