Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
perishableness is a noun meaning "unsatisfactoriness by virtue of being subject to decay or spoilage or destruction". It carries one recorded sense.
unsatisfactoriness by virtue of being subject to decay or spoilage or destruction
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for perishableness come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.