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