ectoderm > define

noun

• The outer germ layer that develops into skin and nervous tissue.
  • synonyms: exoderm, ectoblast

• (n.) The outer layer of the blastoderm; epiblast.
• (n.) The external skin or outer layer of an animal or plant, this being formed in an animal from the epiblast. See Illust. of Blastoderm.