germ layer Hear it!

germ layer definition

germ layer

Embryology any of the three primary layers of cells (ectoderm, endoderm, and mesoderm) from which the various organs and parts of the organism develop by further differentiation

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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