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1. The layer of cells that develops on the surface of the yolk in an avian or reptilian egg and gives rise to the germinal disk from which the embryo develops.
2. The layer of cells formed by the cleavage of a fertilized mammalian egg. It later divides into the three germ layers from which the embryo develops.

blas′to·der·mat′ic (-dər-măt′ĭk), blas′to·der′mic adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Adj.1.blastodermic - of or relating to a blastodermblastodermic - of or relating to a blastoderm  
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References in periodicals archive ?
This toxic effect may be due to the blockade of DNA synthesis elicited by organophosphonc pesticides causing diminished number of blastodermic cells at the time of epiboly, thus hindering the start of invagination.
During blastula formation, the blastodermic cells decrease in size and form an embryonic disc in the animal pole (Fig.
Gastrulation requires the migration of blastodermic cells over the yolk in the process of epiboly (Fig.