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[blas-tuh-durm] /ˈblæs təˌdɜrm/
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 forms
blastodermic, blastodermatic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for 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 Forms
blastodermic, 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
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blastoderm in Medicine

blastoderm blas·to·derm (blās'tə-dûrm') or blas·to·der·ma (blās'tə-dûr'mə)
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. Also called germinal membrane, germ membrane.

blas'to·der'mal or blas'to·der'mic or blas'to·der·mat'ic (-dər-māt'ĭk) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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