marsupialmarsupial(a.) Having a pouch for carrying the immature young; of or pertaining to the Marsupialia.(a.) Of or pertaining to a marsupium; as, the marsupial bones.(n.) One of the Marsupialia.
marsupiummarsupium(n.) The pouch, formed by a fold of the skin of the abdomen, in which marsupials carry their young; also, a pouch for similar use in other animals, as certain Crustacea.(n.) The pecten in the eye of birds and reptiles. See Pecten.