blastoderm

[blas-tuh-durm]

noun Embryology.

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

First recorded in 1855–60; blasto- + -derm

Related formsblas·to·der·mic, blas·to·der·mat·ic, adjective

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for blastoderm

Historical Examples of 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 Works of Francis Maitland Balfour, Volume 1
Francis Maitland Balfour
The growth of the blastoderm has continued to be very rapid.
The Works of Francis Maitland Balfour, Volume 1
Francis Maitland Balfour

British Dictionary definitions for blastoderm

blastoderm

noun embryol

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

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

blastoderm

[blăs′tə-dûrm′]

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•der′mal null null adj.