Skip to Content
Medical Term:


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

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