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