allantois
Noun
Meaning
Alt. of Allantoid
Source: Webster's dictionarySynonyms
Hypernyms
Examples
Although Haeckel is proven right about the allantois, the utilization of Krause’s embryo as justification turns out to be problematic, for the embryo is that of a bird rather than a human.
Haeckel speculates that the allantois is formed in a similar way in both humans and other mammals.