allantois

English Thesaurus

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

hypernym	:	fetal membrane,
definition	:	any membrane that functions for the protection or nourishment or respiration or excretion of a developing fetus (noun.body)

domain category	:	mammal, mammalian,
definition	:	any warm-blooded vertebrate having the skin more or less covered with hair; young are born alive except for the small subclass of monotremes and nourished with milk (noun.animal)

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