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epiblast

American

[ep-uh-blast] / ˈɛp əˌblæst /

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.

epiblast British

/ ˈɛpɪˌblæst /

noun

Also called: ectoblast. embryol the outermost layer of an embryo, which becomes the ectoderm at gastrulation

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

epiblastic

adjective

Etymology

Origin of epiblast

First recorded in 1865–70; epi- + -blast

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

At this point, the head develops from the inner cell layer of the cup, the epiblast, and the tail develops on the opposite side.

From Science Daily • Jun. 18, 2024

The epiblast emits Nodal, while the lid, the extraembryonic endoderm, releases the counterpart BMP.

From Science Daily • Jun. 18, 2024

Transcriptomics analysis revealed that, in POU5F1-null cells, gene expression was downregulated not only for extra-embryonic trophectoderm genes, such as CDX2, but also for regulators of the pluripotent epiblast, including NANOG.

From Nature • Sep. 19, 2017

Control cells clustered according to lineage and are indicated with the coloured bars: red, primitive endoderm; green, epiblast; and blue, trophectoderm.

From Nature • Sep. 19, 2017

In this way a cavity, a., lined by epiblast, and called the amniotic cavity, is formed.

From Text Book of Biology, Part 1: Vertebrata by Wells, H. G. (Herbert George)

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023