vulcanize

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

From Vulcan + -ize.

It is prepared in a manner somewhat similar to that employed in making crude rubber; it is also easily vulcanized by heating with sulphur. — Commercial Geography: A Book for High Schools, Commercial Courses, and Business Colleges, Jacques W. (Jacques Wardlaw) Redway
Even when the secret of vulcanizing, as it is called, was discovered, five years passed before he was able to conduct the process with absolute certainty. — A School History of the United States, John Bach McMaster

vulcanise

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