Relating to or involving both the chorion and allantois, two membranes that develop during embryonic development in animals like birds and mammals.
From chorio- (from Greek chorion, 'skin' or 'membrane') combined with allantoic (from Greek allantois, 'sausage'). These Greek roots were combined in modern scientific terminology to describe structures discovered during embryological studies.
The chorioallantoic membrane in chicken eggs is so powerful that scientists actually grow viruses and test cancer cells on it—it's like nature's perfect petri dish that was hiding in every egg carton!
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