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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.
The possum is not to be confused with the opossum, which is found in North America and is the only marsupial which inhabits areas outside of Australia and it's surrounding islands.Possums tend to be found inhabiting bush-lands and rainforests where the possums live in hollow trees and logs.he possum is not to be confused with the opossum, which is found in North America and is the only marsupial which inhabits areas outside of Australia and it's surrounding islands.