The Collaborative International Dictionary of English v.0.48:

Fervid \Fer"vid\, a. [L. fervidus, fr. fervere. See Fervent.]
   1. Very hot; burning; boiling.
      [1913 Webster]

            The mounted sun
            Shot down direct his fervid rays.     --Milton.
      [1913 Webster]

   2. Ardent; vehement; zealous.
      [1913 Webster]

            The fervid wishes, holy fires.        --Parnell.
      -- Fer"vid*ly, adv. -- Fer"vid*ness, n.
      [1913 Webster]

WordNet (r) 3.0 (2006):

fervid
    adj 1: characterized by intense emotion; "ardent love"; "an
           ardent lover"; "a fervent desire to change society"; "a
           fervent admirer"; "fiery oratory"; "an impassioned
           appeal"; "a torrid love affair" [syn: ardent,
           fervent, fervid, fiery, impassioned, perfervid,
           torrid]
    2: extremely hot; "the fervent heat...merely communicated a
       genial warmth to their half-torpid systems"- Nathaniel
       Hawthorne; "set out...when the fervid heat subsides"- Frances
       Trollope [syn: fervent, fervid]

Moby Thesaurus II by Grady Ward, 1.0:

76 Moby Thesaurus words for "fervid":
   abandoned, ablaze, afire, ardent, athirst, blazing, boiling,
   boiling over, breathless, burning, burning with excitement,
   committed, consumed with desire, cordial, coveting, craving,
   dedicated, delirious, devoted, devoured by desire, devout, drunk,
   earnest, enthusiastic, excited, exuberant, faithful, febrile,
   fervent, fevered, feverish, fiery, flaming, flushed, glowing,
   hearty, heated, hectic, het up, hot, hot-blooded, hungering,
   hungry, impassioned, in earnest, in rut, intense, intent,
   intent on, intoxicated, itching, keen, lively, loyal,
   mad with lust, on fire, passionate, perfervid, prurient, red-hot,
   resolute, seething, serious, sexually excited, sincere, spirited,
   steaming, steamy, thirsting, thirsty, unrestrained, vehement,
   vigorous, warm, white-hot, zealous