vulcanize

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vul·can·ize / ˈvəlkəˌnīz/ • v. [tr.] harden (rubber or rubberlike material) by treating it with sulfur at a high temperature.DERIVATIVES: vul·can·iz·a·ble adj.vul·can·i·za·tion / ˌvəlkənəˈzāshən/ n.vul·can·iz·er n.