the innermost of the three primary germ layers of an embryo that is the source of the epithelium of the digestive tract and its derivatives and of the lower respiratory tract
endoderm
noun(en-do-derm)
a tissue (such as esophageal or pancreatic tissue) derived from this germ layer
endoderm
noun(en-do-derm)
the inner layer of cells of a diploblastic animal (such as a jellyfish or sponge)