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.
[1913 Webster]