hypoblast > define
noun
- The inner germ layer that develops into the lining of the digestive and respiratory systems.
by WordNet 3.0 © 2006 by Princeton University
(n.) The inner or lower layer of the blastoderm; -- called also endoderm, entoderm, and sometimes hypoderm. See Illust. of Blastoderm, Delamination, and Ectoderm.
by Webster's Revised Unabridged Dictionary