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