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Pronunciation: ek'to-blast


  1. As used by some experimental embryologists, the original outer cell layer from which the primary germ layers are formed; in this sense, synonymous with epiblast.
  2. A cell wall.

Synonym(s): ectoderm

[ecto- + G. blastos, germ]

See Also: epiblast

Further information

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.