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Meaning of blastoderm

blas•to•derm

Pronunciation: (blas'tu-dûrm"), [key]
— n. Embryol.
  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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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