noun Embryology.
the primordial outer layer of a young embryo before the segregation of the germ layers, capable of becoming the ectoderm and containing cells capable of becoming the mesoderm and endoderm.

1865–70; epi- + -blast

epiblastic, adjective
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World English Dictionary
epiblast (ˈɛpɪˌblæst)
embryol Also called: ectoblast the outermost layer of an embryo, which becomes the ectoderm at gastrulation

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Medical Dictionary

epiblast ep·i·blast (ěp'ə-blāst')
The outer layer of a blastula that gives rise to the ectoderm after gastrulation.

ep'i·blast'ic adj.
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