Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
postmortal is an adjective meaning "occurring or done after death". It carries one recorded sense.
occurring or done after death
“postmortem changes”
“a postmortem examination to determine cause of death”
“postmortal wounds”
Definitions, synonyms and semantic relations for postmortal come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.