vulcanize
Concise Oxford English Dictionary © 2008 Oxford University Press:
vulcanize /ˈvʌlkənʌɪz/ (or vulcanise /ˈvʌlkənʌɪz/)
▶verb harden (rubber or rubber-like material) by treating it with sulphur at a high temperature.
– derivatives
vulcanizable adjective,
vulcanization noun,
vulcanizer noun.
vulcanizable adjective,
vulcanization noun,
vulcanizer noun.
'vulcanize' also found in these Oxford entries:

