Source : Webster's Revised Unabridged Dictionary (1913)

Febrile \Fe"brile\ (?; 277), a. [F. f['e]brile, from L. febris
   fever. See {Fever}.]
   Pertaining to fever; indicating fever, or derived from it;
   as, febrile symptoms; febrile action. --Dunglison.

Source : WordNet®

febrile
     adj : of or relating to or characterized by fever; "a febrile
           reaction caused by an allergen" [syn: {feverish}] [ant:
            {afebrile}]