from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The innermost of the three primary germ layers of an animal embryo, developing into the gastrointestinal tract, the lungs, and associated structures. Also called hypoblast.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. One of the three tissue layers in the embryo of a metazoan animal. Through development, it will produce the digestive system of the adult.
from the GNU version of the Collaborative International Dictionary of English
- n. The inner layer of the skin or integument of an animal.
- n. The innermost layer of the blastoderm and the structures derived from it; the hypoblast; the entoblast. See Illust. of ectoderm.
from The Century Dictionary and Cyclopedia
- n. In zoology, the completed inner layer of cells in all metazoan animals, formed by the cells of the hypoblast or endoblast, and representing, under whatever modification, the lining of the enteron: opposed to ectoderm.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the inner germ layer that develops into the lining of the digestive and respiratory systems
From endo- + Ancient Greek δέρμα (derma, "skin"). (Wiktionary)