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Endoderm

/ˈendəˌdərm/

Noun

1. One of the three tissue layers in the embryo of a metazoan animal. Through development, it will produce the digestive system of the adult. (wiktionary.org)

2. The innermost layer of cells or tissue of an embryo in early development, or the parts derived from this, which include the lining of the gut and associated structures. (Google Dictionary)

3. The innermost of the three primitive germ layers of the embryo; from it are derived the epithelium of the pharynx, respiratory tract (except the nose), digestive tract, bladder, and urethra. (Dorland’s Medical Dictionary for Health Consumers.)

4. The inner germ layer that develops into the lining of the digestive and respiratory systems. (wordnetweb.princeton.edu)

Word origin: From endo- + Ancient Greek δέρμα (derma, “skin”).