Definition: vulcanization

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Source: WordNet (r) 1.7 

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]

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.