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]