Noun
Alt. of Allantoid
Source: Webster's dictionaryAlthough 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. Source: Internet
Haeckel speculates that the allantois is formed in a similar way in both humans and other mammals. Source: Internet