- the primitive layer of cells that results from the segmentation of the ovum.
- the layer of cells forming the wall of the blastula, and in most vertebrates enclosing a cavity or a yolk mass.
Origin of blastoderm
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for blastoderm
Blastoderm: the germinal membrane from which the organs of the embryo are formed.Explanation of Terms Used in Entomology
John. B. Smith
He it was who introduced the terms "Keimhaut" (blastoderm) and "Keimblatt" (germ-layer).Form and Function
E. S. (Edward Stuart) Russell
About two-thirds of the yolk have been enveloped by the blastoderm.The Works of Francis Maitland Balfour, Volume IV (of 4)
Francis Maitland Balfour
The points of similarity are— The swollen edge of the blastoderm.
The growth of the blastoderm has continued to be very rapid.
- the layer of cells that surrounds the blastocoel of a blastula
- a flat disc of cells formed after cleavage in a heavily yolked egg, such as a bird's egg
Also called: blastodisc
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
- The layer of cells formed by the cleavage of a fertilized mammalian egg, which later divides into the three germ layers from which the embryo develops.germinal membrane germ membrane
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.