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.

Nearby words

  1. epi-,
  2. epiandrosterone,
  3. epibenthos,
  4. epibiosis,
  5. epibiotic,
  6. epiblem,
  7. epiblepharon,
  8. epibolic,
  9. epiboly,
  10. epibulbar

Origin of epiblast

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

Related formsep·i·blas·tic, adjective

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for epiblast

British Dictionary definitions for epiblast



embryol the outermost layer of an embryo, which becomes the ectoderm at gastrulationAlso called: ectoblast
Derived Formsepiblastic, adjective

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

Medicine definitions for epiblast




The outer layer of a blastula that gives rise to the ectoderm after gastrulation.
Related formsep′i•blastic adj.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.