Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. the outer layer of the blastoderm; the ectoderm or epiblast

from the GNU version of the Collaborative International Dictionary of English

  • n. The outer layer of the blastoderm; the epiblast; the ectoderm.
  • n. The outer envelope of a cell; the cell wall.

from The Century Dictionary and Cyclopedia

  • n. In biology, the outermost recognizable structure of a cell; a cell-wall, in any way distinguished from mesoblast or other more interior structures. The ectoblast is to a cell what the epiblast is to a more complex organism.
  • n. In embryology, the outer primary layer in the embryo of any metazoan animal; the epiblast; the ectoderm. See cut under blastocæle.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the outer germ layer that develops into skin and nervous tissue

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