• Webster's Revised Unabridged Dictionary
    • a Didelphous (Zoöl) Didelphic.
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Century Dictionary and Cyclopedia
    • didelphous Resembling or having the characters of the Didelphia or Marsupialia.
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In literature:

There are three kinds of didelphic or marsupial animals on the coast.
"Travels in Peru, on the Coast, in the Sierra, Across the Cordilleras and the Andes, into the Primeval Forests" by J. J. von Tschudi