marsupium

n.

1.

(Anat. & Zool.) 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.

Noun

1.

marsupium - an external abdominal pouch in most marsupials where newborn offspring are suckled

pocket, pouch