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1. Oxford Dictionary

   allantois

   • IPA[əˈlantəʊɪs]

   英式

   • n.
     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.

   • noun: allantois, plural noun: allantoides

2. • 更多解釋

   allantois

   • IPA[əˈlantəwəs]

   美式

   • n.
     the fetal membrane lying below the chorion in many vertebrates, formed as an outgrowth of the ...

   Oxford American Dictionary