Hypoblast :: Hypoblast (n.) The inner or lower layer of the blastoderm; -- called also endoderm, entoderm, and sometimes hypoderm. See Illust. of Blastoderm, Delamination, and Ectoderm..
Hypoblastic :: Hypoblastic (a.) Relating to, or connected with, the hypoblast; as, the hypoic sac..