ALLANTOIS

allantois

(noun) the vascular fetal membrane that lies below the chorion and develops from the hindgut in many embryonic higher vertebrates (reptiles, birds and mammals)

Source: WordNet® 3.1

Etymology

Noun

allantois (plural allantoises or allantoides)

(anatomy) A sac, having a number of functions, that develops in the alimentary canal of the embryos of mammals, birds and reptiles.

Synonyms

• allantoic sac

• allantoid

Anagrams

• Atlas lion

Source: Wiktionary

Al*lan"to*is, Al*lan"toid, } n.. (Anat.)

Definition: A membranous appendage of the embryos of mammals, birds, and reptiles, -- in mammals serving to connect the fetus with the parent; the urinary vesicle.

Source: Webster’s Unabridged Dictionary 1913 Edition