Ec‐ten″tal (?), a.(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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.