Type genus of the family Didelphidae

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Didelphys \Di*del"phys\, n. [NL. See Didelphia .] (Zo["o]l.) Formerly, any marsupial; but the term is now restricted to an American genus which includes the opossums, of which there are many species. See Opossum . [Written also Didelphis .] See Illustration ...

Wikipedia Word definitions in Wikipedia
The six species in the genus Didelphis , commonly known as large American opossums , are members of the order Didelphimorphia . The genus is composed of cat-sized omnivorous species, and are recognized on their prehensile tails and the tendency to "play ...