germ layer

noun
one of the three primary embryonic cell layers.


Origin:
1875–80

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Collins
World English Dictionary
germ layer
 
n
embryol ectoderm mesoderm See endoderm any of the three layers of cells formed during gastrulation

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

germ layer n.
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.
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American Heritage
Science Dictionary
germ layer  
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
There are a variety of body tissues derived from the third or middle primary germ layer known as the mesoderm.
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