HYPOBLAST
endoderm, entoderm, endoblast, entoblast, hypoblast
(noun) the inner germ layer that develops into the lining of the digestive and respiratory systems
Source: WordNet® 3.1
Etymology
Noun
hypoblast (plural hypoblasts)
(embryology) A type of tissue that forms from the inner cell mass and later is incorporated into the endoderm
Source: Wiktionary
Hy"po*blast, n. Etym: [Pref. hypo- + -blast.] (Biol.)
Definition: The inner or lower layer of the blastoderm; -- called also
endoderm, entoderm, and sometimes hypoderm. See Illust. of
Blastoderm, Delamination, and Ectoderm.
Source: Webster’s Unabridged Dictionary 1913 Edition