1. the act or process of turning outward or inside out; the state of being turned outward.
Usage: technical; biology
2. in embryology, the outgrowth or extension of a tissue layer or organ from a surface.
Usage: technical; developmental biology

Examples

• The evagination of the optic vesicle during eye development is a critical stage in embryogenesis.
• Evagination and invagination are opposite processes that shape many organs during fetal development.
• The tissue underwent evagination, folding outward rather than inward.
• In some organisms, evagination of the gut wall leads to the formation of new structures.
• The biologist studied the evagination process under the microscope to understand organ formation.