'Ectental' definitions:

Definition of 'Ectental'

From: GCIDE

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. [1913 Webster]