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From The Collaborative International Dictionary of English v.0.48:
Didelphys \Di*del"phys\, n. [NL. See Didelphia.] (Zool.)
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 in Appendix. --Cuvier.