allantois

Term: allantois

Origin: Anc Greek αλλάs/allas(=saugage), 
genitive άλλαντος/allantos because allantois resembles to sausage.
>άλλος/allos(=other) + εντός/entos(=inside) because intestine is filled inside with meat.

Definition: An extra-embryonic membrane that helps the embryo exchange gases and handle liquid waste.