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.

1855–60; blasto- + -derm

blastodermic, blastodermatic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
blastoderm (ˈblæstəʊˌdɜːm)
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

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
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