Etymology
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marsupial (adj.)

"of or pertaining to the implacental mammals," who usually are provided with a pouch for their young, 1690s, with -al (1) + Modern Latin marsupialis "having a pouch," coined from Late Latin marsupium "pouch, purse" (Classical Latin marsuppium), from Greek marsipion, diminutive of marsipos,marsippos "bag, pouch, purse," a word of foreign or Pre-Greek origin. As a noun, "a marsupial animal, an implacental didelphian mammal," from 1805.

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Definitions of marsupial
1
marsupial (n.)
mammals of which the females have a pouch (the marsupium) containing the teats where the young are fed and carried;
Synonyms: pouched mammal
2
marsupial (adj.)
of or relating to the marsupials;
marsupial animals
From wordnet.princeton.edu