Added 9 October 2026 possum /ˈpɒsəm/ noun Categories: AnimalsRare Words noun ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about possum at Wordnik → Where our words come from → Nocturnal arboreal marsupial having a naked prehensile tail found from southern North America to northern South America. Small furry Australian arboreal marsupials having long usually prehensile tails. Related Words: opossumphalangerringtailtrotuncopposummanicoudidelphiddidelphimorph Back to today's word