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The Collaborative International Dictionary
Ectental

Ectental \Ec*ten"tal\, a. [Gr. 'ekto`s outside + ? inside.] (Biol.) Relating to, or connected with, the two primitive germ layers, the ectoderm and ectoderm; as, the ``ectental line'' or line of juncture of the two layers in the segmentation of the ovum.
--C. S. Minot.

Wiktionary
ectental

a. (context biology English) Relating to, or connected with, the two primitive germ layers, the ectoderm and endoderm.