Source : Webster's Revised Unabridged Dictionary (1913)

Vulcanization \Vul`can*i*za"tion\, n. [See {Vulcan}.]
   The act or process of imparting to caoutchouc, gutta-percha,
   or the like, greater elasticity, durability, or hardness by
   heating with sulphur under pressure.

Source : WordNet®

vulcanization
     n : process of treating rubber or rubberlike materials with
         sulphur at great heat to improve elasticity and strength
         or to harden them [syn: {vulcanisation}]