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Birds
Answer for the clue "Birds ", 9 letters:
allantois
Alternative clues for the word allantois
Word definitions for allantois in dictionaries
Wikipedia
Word definitions in Wikipedia
Allantois (; plural allantoides or allantoises ) is a sac-like structure that forms part of a developing amniote 's conceptus (which consists of all embryonic and extra-embryonic tissues). It helps the embryo exchange gases and handle liquid waste. The ...
Wiktionary
Word definitions in Wiktionary
n. (context anatomy English) A sac, having a number of functions, that develops in the alimentary canal of the embryos of mammals, birds and reptiles.
The Collaborative International Dictionary
Word definitions in The Collaborative International Dictionary
Allantois \Al*lan"to*is\, Allantoid \Al*lan"toid\, ] n.. (Anat.) A membranous appendage of the embryos of mammals, birds, and reptiles, -- in mammals serving to connect the fetus with the parent; the urinary vesicle.
WordNet
Word definitions in WordNet
n. vascular fetal membrane that develops from the hindgut in embryonic higher vertebrates (reptiles, birds and mammals)