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The definition of a possum, or opossum, is a tree-dwelling nocturnal marsupial with fur and a prehensile tail. A small Australian mammal that lives in a tree and only comes out at night is an example of a possum. possum. possum.
Wiktionary (0.00 / 0 votes) Rate this definition: possum (Noun). Any of marsupials in several families of the order Diprotodontia of Australia and neighboring islands. possum (Noun). Popular form for opossum, a marsupial of the family Didelphidae of the Americas.iktionary (0.00 / 0 votes) Rate this definition: possum (Noun). Any of marsupials in several families of the order Diprotodontia of Australia and neighboring islands. possum (Noun). Popular form for opossum, a marsupial of the family Didelphidae of the Americas.