1. relating to or denoting tissues or structures that develop outside the embryo proper but are essential for its growth and protection during development
Usage: biology/embryology term; commonly used in medical and developmental biology contexts

Examples

• The placenta is an extraembryonic structure that connects the developing fetus to the mother.
• Extraembryonic membranes include the amnion, chorion, and allantois.
• The yolk sac is an extraembryonic organ that provides nutrients to the early embryo.
• During pregnancy, extraembryonic tissues play a crucial role in fetal development and protection.
• The umbilical cord is part of the extraembryonic system that supports the growing fetus.