ALLANTOIS

Pronunciation (US):

(GB):

 I. (noun) 

Sense 1

Meaning:

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

Classified under:

Nouns denoting animals

Hypernyms ("allantois" is a kind of...):

fetal membrane (any membrane that functions for the protection or nourishment or respiration or excretion of a developing fetus)

Domain category:

mammal; mammalian (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)

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