The Collaborative International Dictionary of English v.0.48:

Fumigate \Fu"mi*gate\, v. t. [imp. & p. p. Fumigated; p. pr. &
   vb. n. Fumigating.] [L. fumigate, p. p. of fumigare to
   fumigate, fr. fumus smoke. See Fume, n.]
   1. To apply smoke to; to expose to smoke or vapor; to purify,
      or free from infection, by the use of smoke or vapors.
      [1913 Webster]

   2. To smoke; to perfume. --Dryden.
      [1913 Webster]

WordNet (r) 3.0 (2006):

fumigate
    v 1: treat with fumes, expose to fumes, especially with the aim
         of disinfecting or eradicating pests [syn: fumigate,
         fume]

Moby Thesaurus II by Grady Ward, 1.0:

50 Moby Thesaurus words for "fumigate":
   aerate, aerify, antisepticize, aromatize, atomize, autoclave, boil,
   carbonate, cense, chlorinate, cleanse, decontaminate, delouse,
   disinfect, distill, embalm, emit, etherify, etherize, evaporate,
   exhale, fluidize, fractionate, freshen the air, fume, gasify,
   give off, hydrogenate, hygienize, incense, odorize, oxygenate,
   pasteurize, perfume, purify, reek, sanitate, sanitize, scent,
   send out, smoke, spray, steam, sterilize, sublimate, sublime,
   thurify, vaporize, ventilate, volatilize