This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. To improve the strength, resiliency, and freedom from stickiness and odor of (rubber, for example) by combining with sulfur or other additives in the presence of heat and pressure.

v. To treat rubber with heat and (usually) sulphur to harden it and make it more durable.

v. To desertify or create a xeric landscape

v. To change the properties of, as caoutchouc, or India rubber, by the process of vulcanization.

To subject to the process of vulcanization, as caoutchouc

To admit of vulcanization.

Also spelled vulcanise.

v. undergo vulcanization

v. subject to vulcanization

"Precisely because a human soul is unstable, and subject to influence, and hardening over time, the Christian tradition has put a great deal of weight on moral and spiritual discipline in order to "vulcanize" the networks that lead to properly ordered emotions, thoughts, and decisions."

vulcanized    vulcanizes    vulcanizing   

change    process    treat   

vulcanized glass    vulcanized rubber    vulcanized fiber    Vulcan   

vulcanite    vulcanology    vulcanicity   

vulcanized    vulcanizing    vulcanisation    vulcanization    vulcanizer