allantois /əˈlantəʊɪs/


I. noun

the fetal membrane lying below the chorion in many vertebrates, formed as an outgrowth of the embryo’s gut. In birds and reptiles it grows to surround the embryo; in eutherian mammals it forms part of the placenta.
II. derivatives

1. allantoic

2. allantoid

– origin mid 17th cent.: modern Latin, based on Greek allantoeidēs ‘sausage-shaped’.

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