'Possum' definitions:

Definition of 'possum'

From: WordNet
noun
Nocturnal arboreal marsupial having a naked prehensile tail found from southern North America to northern South America [syn: opossum, possum]
noun
Small furry Australian arboreal marsupials having long usually prehensile tails [syn: phalanger, opossum, possum]

Definition of 'Possum'

From: GCIDE
  • Possum \Pos"sum\, n. [Shortened from opossum.] (Zool.) An opossum. [Colloq. U. S.] [1913 Webster]
  • To play possum, To act possum, to feign ignorance, indifference or inattention, with the intent to deceive; to dissemble; -- in allusion to the habit of the opossum, which feigns death when attacked or alarmed. [1913 Webster]