n. - A membranous appendage of the embryos of mammals, birds,
and reptiles, -- in mammals serving to connect the fetus with the
parent; the urinary vesicle.
a. - Alt. of Allantoidal
n. - A membranous appendage of the embryos of mammals, birds,
and reptiles, -- in mammals serving to connect the fetus with the
parent; the urinary vesicle.