noun Embryology, Zoology.
Origin of allantois
Examples from the Web for allantois
A very early condition of Man, with yelk-sac, allantois, and amnion (original).Lectures and Essays|T.H. Huxley
The blood vessels of the allantois take in oxygen and give out carbon dioxide through the porous shell.The Meaning of Evolution|Samuel Christian Schmucker
Then, later, the placenta replaces the allantois, and the latter passes away as did its predecessor.Private Sex Advice to Women|R. B. Armitage
The ureters (fig. 407, 3) open higher up than the other ducts into the stalk of the allantois which dilates to form the bladder .
The allantois was quite free and not attached to the subzonal membrane.