: the outer layer of the blastoderm : ectoderm

Word History

First Known Use

1875, in the meaning defined above

Time Traveler
The first known use of epiblast was in 1875

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Cite this Entry

“Epiblast.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/epiblast. Accessed 21 Mar. 2025.

Medical Definition

: the outer layer of the blastoderm : ectoderm
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