| NOUN | animal | allantois | the vascular fetal membrane that lies below the chorion and develops from the hindgut in many embryonic higher vertebrates (reptiles, birds and mammals) |
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| Meaning | The vascular fetal membrane that lies below the chorion and develops from the hindgut in many embryonic higher vertebrates (reptiles, birds and mammals). | |
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| Category | mammal, mammalian | Any warm-blooded vertebrate having the skin more or less covered with hair |
| Broader | fetal membrane | Any membrane that functions for the protection or nourishment or respiration or excretion of a developing fetus |
| Spanish | alantoides | |
| Catalan | alantoides, al·lantoide, membrana al·lantoide | |
| Adjectives | allantoic | relating to or characterized by an allantois |
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