Noun
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.
The pecten in the eye of birds and reptiles. See Pecten.
Source: Webster's dictionaryThe specific epithet marsupialis comes from the Latin marsupium ("pocket"); it refers to a pocket-like skin flap which extends along the midline of the back from the tail. Source: Internet
The female has a marsupium (pouch) in the middle of her abdomen to carry offspring. Source: Internet
The offspring are eventually able to leave the marsupium for short periods, returning to it for warmth, protection, and nourishment. Source: Internet