Epiblast

noun

1. The outer layer of a blastula that gives rise to the ectoderm after gastrulation.
2. In botany, a name applied by Richard to a second small cotyledon which is found in wheat and some other grasses.
3. In embryology, the outer or external blastodermic membrane or layer of cells, forming the ectoderm or epiderm: distinguished at first from hypoblast, then from both hypoblast and mesoblast. See cut under blastocæle.
4. The outer layer of the blastoderm; the ectoderm. See blastoderm, delamination.
5. the outer layer of a blastula that, after gastrulation, becomes the ectoderm