[ noun ] the inner germ layer that develops into the lining of the digestive and respiratory systems <noun.animal>
Entoderm \En"to*derm\, n. [Ento- + Gr. ? skin.] (Biol.) See {Endoderm}, and Illust. of {Blastoderm}.
Hypoblast \Hy"po*blast\, n. [Pref. hypo- + -blast.] (Biol.) The inner or lower layer of the blastoderm; -- called also {endoderm}, {entoderm}, and sometimes {hypoderm}. See Illust. of {Blastoderm}, {Delamination}, and {Ectoderm}.