1. of or relating to the chorioallantois, a membrane formed by fusion of the chorion and allantois in embryonic development, especially in birds and mammals
Usage: technical; biology; embryology

Examples

• The chorioallantoic membrane is commonly used in laboratory research to study viral infections.
• Chicken embryos develop a well-formed chorioallantoic membrane by the third day of incubation.
• Scientists use the chorioallantoic membrane as a model system for vaccine testing.
• The chorioallantoic placenta provides oxygen and nutrients to the developing mammalian fetus.
• Researchers grafted tumor cells onto the chorioallantoic membrane to observe their growth patterns.