Relating to or resembling the allantois, a membrane structure in developing embryos and some animals.
From 'allantois' (Greek 'allas' meaning sausage + '-tois' meaning resembling) + '-al' (relating to). The structure was named for its sausage-like appearance.
The allantois is why human babies can exchange oxygen and waste with their mothers—it's an ancient evolutionary structure we inherited from reptiles that's absolutely essential to fetal development but mostly invisible.
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