What is "entoblast"

Entoblast \En"to*blast\, n. [Ento- + -blast.] (Biol.) The inner germ layer; endoderm. See Nucleolus. [1913 Webster] ||

n. Any of the embryonic blastomeres that develop into the endoderm

n. the inner germ layer that develops into the lining of the digestive and respiratory systems [syn: endoderm, entoderm, endoblast, hypoblast]