n. The act of volcanizing, or the state of being volcanized; the process of undergoing volcanic heat, and being affected by it. [ 1913 Webster ]
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. [ 1913 Webster ]