blastodisk

or blas·to·disc

[ blas-tuh-disk ]
/ ˈblæs təˌdɪsk /

noun Embryology.

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

Origin of blastodisk

First recorded in 1885–90; blasto- + disk

British Dictionary definitions for blastodisc

blastodisc
/ (ˈblæstəʊˌdɪsk) /

noun

another name for blastoderm

Medical definitions for blastodisc

blastodisk

n.

The disk of active cytoplasm at the animal pole of a telolecithal egg.
The blastoderm, especially in very early stages when its extent is small.