Source : Webster's Revised Unabridged Dictionary (1913)

Febrifuge \Feb"ri*fuge\, n. [L. febris fever + fugare to put to
   flight, from fugere to flee: cf. F. f['e]brifuge. see
   {Febrile}, {Feverfew}.] (Med.)
   A medicine serving to mitigate or remove fever. -- a.
   Antifebrile.

Source : WordNet®

febrifuge
     n : any medicine that lowers body temperature to prevent or
         alleviate fever [syn: {antipyretic}]