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ectoderm

From The Collaborative International Dictionary of English v.0.48:

Ectoderm \Ec"to*derm\, n. [Ecto- + -derm.] (Biol.)
   (a) The outer layer of the blastoderm; epiblast.
   (b) The external skin or outer layer of an animal or plant,
       this being formed in an animal from the epiblast. See
       Illust. of Blastoderm. Ectodermal

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