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Dictionary

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.

blastocyst

blastodisk

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