n. & adj.
--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