endoderm Definition
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endoderm
noun
- 1a. In a multicellular animal that has two or more layers of body tissue: the innermost layer of cells of the embryo, which develops into the digestive system of the adult, also forming the yolk sac and allantois in birds and mammals;
1b. In a multicellular animal that has two or more layers of body tissue: the tissues directly derived from this layer. Compare ectoderm, mesoderm.
