noun Embryology.
  1. the primitive layer of cells that results from the segmentation of the ovum.
  2. the layer of cells forming the wall of the blastula, and in most vertebrates enclosing a cavity or a yolk mass.

Origin of blastoderm

First recorded in 1855–60; blasto- + -derm
Related formsblas·to·der·mic, blas·to·der·mat·ic, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for blastoderm

Historical Examples of blastoderm

British Dictionary definitions for blastoderm


noun embryol
  1. the layer of cells that surrounds the blastocoel of a blastula
  2. a flat disc of cells formed after cleavage in a heavily yolked egg, such as a bird's egg
Also called: blastodisc
Derived Formsblastodermic, 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

blastoderm in Medicine


  1. 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
Related formsblas′to•dermal null null adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.