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]

Moby Thesaurus II by Grady Ward, 1.0:

67 Moby Thesaurus words for "febrile":
   ablaze, afire, ardent, at fever pitch, boiling, boiling over,
   breathless, burning, burning with excitement, cordial, delirious,
   drunk, enthusiastic, excited, exuberant, fanatical, fervent,
   fervid, fevered, feverish, feverous, fiery, flaming, flushed,
   frantic, frenetic, frenzied, furious, glowing, hearty, heated,
   hectic, het up, hot, hyperpyretic, hyperthermic, hysteric,
   impassioned, in a fever, in rut, infatuated, inflamed, insane,
   intense, intoxicated, keen, lively, on fire, overanxious,
   overdesirous, overeager, overenthusiastic, overzealous, passionate,
   perfervid, pyretic, red-hot, seething, sexually excited, steaming,
   steamy, ultrazealous, unrestrained, vigorous, warm, wild,
   zealous