macromere
/ˈmækroʊˌmɪr/
noun
- A large cell or blastomere formed during the early development of an embryo, especially in invertebrates.
- The macromere gives rise to the endoderm, which forms the lining of the digestive tract.
- In the developing snail embryo, the macromere divides more slowly than the smaller cells.
- Scientists observed that the macromere contains most of the yolk in the early frog embryo.