The Collaborative International Dictionary of English v.0.48:
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. [1913 Webster]WordNet (r) 3.0 (2006):
febrile adj 1: of or relating to or characterized by fever; "a febrile reaction caused by an allergen" [syn: febrile, feverish] [ant: afebrile]