The Collaborative International Dictionary of English v.0.48:

Vulcanize \Vul"can*ize\, v. t. [imp. & p. p. Vulcanized; p.
   pr. & vb. n. Vulcanizing.]
   To change the properties of, as caoutchouc, or India rubber,
   by the process of vulcanization.
   [1913 Webster]

   Vulcanized fiber, paper, paper pulp, or other fiber,
      chemically treated, as with metallic chlorides, so as to
      form a substance resembling ebonite in texture, hardness,
      etc. --Knight.

   Vulcanized rubber, India rubber, vulcanized.
      [1913 Webster]

WordNet (r) 3.0 (2006):

vulcanize
    v 1: undergo vulcanization; "vulcanize rubber" [syn:
         vulcanize, vulcanise]
    2: subject to vulcanization; "vulcanized rubber" [syn:
       vulcanize, vulcanise]

Moby Thesaurus II by Grady Ward, 1.0:

29 Moby Thesaurus words for "vulcanize":
   blaze, blister, brand, burn, burn in, burn off, cast, cauterize,
   char, coal, crack, cupel, elasticize, flame, found, oxidate,
   oxidize, parch, pyrolyze, rubber, rubberize, scorch, sear, singe,
   solder, swinge, torrefy, vesicate, weld