Webster’s Revised Unabridged Dictionary · 1913
Vulcanization
Vul′can·i·za′tion (·ĭ·zā′shŭn), 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.