blastodisk

American  

[blas-tuh-disk] / ˈblæs təˌdɪsk /

Or blastodisc

noun

Embryology.

1. the blastula that forms as a flattened sphere on top of the yolk in the yolk-laden eggs of birds and reptiles.

---

Etymology

Origin of blastodisk

First recorded in 1885–90; blasto- + disk