What Does Marsupial Mean?

As a noun marsupial refers to any of an assortment of non-placental mammals belonging to the order Marsupialia. These would include kangaroos, opossums, wombats and bandicoots found primarily in Australia as well as the Americas.

As an adjective it would mean belonging to or of the order Marsupialia. It could mean of or pertaining to a marsupium.

Marsupials may also be described mammals of which female counterparts have a pouch (that is, the marsupium) which contain the teats to feed and carry their young. They are also sometimes called pouched mammals. These mammals belong to the Infraclass: Marsupialia; the Subclass: Theria; the Class: Mammalia; the Phylum: Chordata; and the Kingdom: Animalia. The word marsupial originates from marsupium, the abdominal pouch.

It has a pouch

Any of various mammals of the order Marsupialia, whose young are very undeveloped when born and continue developing outside their mother's body attached to one of her nipples. Most marsupials have longer hindlegs than forelimbs, and the females usually have pouches in which they carry their young. Kangaroos, opossums, and koalas are marsupials.