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Medical Term:

ectoderm

Pronunciation: ek′tō-dĕrm

Definition: The outer layer of cells in the embryo, after establishment of the three primary germ layers (ectoderm, mesoderm, endoderm), the germ layer in contact with the amnionic cavity.

Synonym(s): ectoblast1

[ecto- + G. derma, skin]

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