Source : Webster's Revised Unabridged Dictionary (1913)

Vulcanizer \Vul"can*i`zer\, n.
   One who, or that which, vulcanizes; esp., an apparatus for
   vulcanizing caoutchouc.

Source : WordNet®

vulcanizer
     n : someone who vulcanizes rubber to improve its strength and
         resiliency [syn: {vulcaniser}]