Relating to both the amnion and the allantois, two membranes in developing embryos that sometimes fuse together.
Compound from amnio- (amnion) plus allantoic (relating to the allantois, from Greek allantois meaning 'sausage'). Used in embryology to describe fused membrane structures.
In bird and reptile embryos, the amnioallantoic membrane takes over the job that the placenta does in mammals—it's a completely different engineering solution to the same problem of feeding a developing baby.
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