The Collaborative International Dictionary of English v.0.48:

Volcanize \Vol"can*ize\, v. t. [imp. & p. p. Volcanized; p.
   pr. & vb. n. Volcanizing.] [Cf. Vulcanize.]
   To subject to, or cause to undergo, volcanic heat, and to be
   affected by its action.
   [1913 Webster]