- one of the three primary embryonic cell layers.
Origin of germ layer
First recorded in 1875–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for germ layer
He it was who introduced the terms "Keimhaut" (blastoderm) and "Keimblatt" (germ-layer).
Remak is the second great name in the history of the germ-layer theory.
He used the germ-layer theory to prove the essential unity of type of all the Triploblastica.
If the germ-layer theory is no longer credited, upon what fundamental laws is embryology based?The Origin of Vertebrates
Walter Holbrook Gaskell
In this manner the foundations of the germ-layer theory were established in their modern form.
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
- Any of the three primary cellular layers, the ectoderm, endoderm, or mesoderm, into which most animal embryos differentiate and from which the organs and tissues of the body develop.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
- Any of three cellular layers, the ectoderm, endoderm, or mesoderm, into which most animal embryos differentiate in the gastrula stage and from which the organs and tissues of the body develop through further differentiation.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.