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WordNet 3.0Copyright Princeton University
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n. - The outer germ layer that develops into skin and nervous tissue.

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Usage examples (35)
  • Both the skin and the brain are derived from the same embryonic tissue, which is known as the ectoderm.
  • At the very early stages, the cells are lumped into 3 layers, called the ectoderm, mesoderm, and endoderm.
  • The point to remember is, that in all cases a gastrula is an open sac composed of two layers of cells -- the outer layer being called the ectoderm, and the inner the...
  • Ectoblast: the outer wall of a cell; the ectoderm or epiblast.
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