The Collaborative International Dictionary of English v.0.48:
Entoblast \En"to*blast\, n. [Ento- + -blast.] (Biol.) The inner germ layer; endoderm. See Nucleolus. [1913 Webster]WordNet (r) 3.0 (2006):
entoblast n 1: the inner germ layer that develops into the lining of the digestive and respiratory systems [syn: endoderm, entoderm, endoblast, entoblast, hypoblast]