blastoderm
/ˈblæstəˌdɜrm/
noun
- A layer of cells that forms on the surface of a fertilized egg and develops into the embryo.
- Damage to the blastoderm can prevent the embryo from developing properly.
- The scientist examined the blastoderm under a microscope to study early cell division.
- In a chicken egg, the blastoderm appears as a small white spot on the yolk.