Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
unvulcanised is an adjective meaning "(used of rubber) not subjected to the process of vulcanization". It carries one recorded sense.
(used of rubber) not subjected to the process of vulcanization
Definitions, synonyms and semantic relations for unvulcanised come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.