Definition of vulcanized adjective from the Oxford Advanced Learner's Dictionary

 

vulcanized

 adjective
(British English also -ised)adjective
BrE BrE//ˈvʌlkənaɪzd//
 
; NAmE NAmE//ˈvʌlkənaɪzd//
 
(specialist)
 
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(of rubber) treated with sulphur at great heat to make it stronger Word Origin early 19th cent. (in the sense ‘throw into a fire’): from Vulcan + -ized.
See the Oxford Advanced American Dictionary entry: vulcanized