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Pronunciation: blas′tō-derm, -tō-der′ma
Definition: The thin, disc-shaped cell mass of a young embryo and its extraembryonic extensions over the surface of the yolk; when fully formed, all three primary germ layers (ectoderm, endoderm, and mesoderm) are present.
Synonym(s): germ membrane, germinal membrane, membrana germinativa
[blasto- + G. derma, skin]
Examples: glitazone, GI cocktail, etc.
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