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Definition of Allantois
1. Noun. The vascular fetal membrane that lies below the chorion and develops from the hindgut in many embryonic higher vertebrates (reptiles, birds and mammals).
Definition of Allantois
1. Noun. (anatomy) A sac, having a number of functions, that develops in the alimentary canal of the embryos of mammals, birds and reptiles. ¹
¹ Source: wiktionary.com
Definition of Allantois
1. [n -TOIDES]
Medical Definition of Allantois
1. An embryonic diverticulum of the hindgut of reptiles, birds, and mammals; in man its blood vessels give rise to those of the umbilical cord. (12 Dec 1998)
Lexicographical Neighbors of Allantois
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