—n. any mammal of the order Marsupialia, characterized by being born incompletely developed and usu. carried and suckled in a pouch on the mother's belly.
—adj.
1 of or belonging to this order.
2 of or like a pouch (marsupial muscle).
Etymology: mod.L marsupialis f. L marsupium f. Gk marsupion pouch, dimin. of marsipos purse
Useful english dictionary. 2012.