didelphis

from WordNet (r) 3.0 (2006)

Didelphis
    n 1: type genus of the family Didelphidae [syn: {Didelphis},
         {genus Didelphis}]

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.
   [1913 Webster]