The Collaborative International Dictionary of English v.0.48:

Didelphid \Di*del"phid\, a. (Zool.)
   Same as Didelphic.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Didelphid \Di*del"phid\, n. (Zool.)
   A marsupial animal.
   [1913 Webster]