from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The outermost of the three primary germ layers of an embryo, from which the epidermis, nervous tissue, and, in vertebrates, sense organs develop.
- n. The outer layer of a diploblastic animal, such as a jellyfish.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Outermost of the three tissue layers in the embryo of a metazoan animal. Through development, it will produce the epidermis (skin) and nervous system of the adult.
from the GNU version of the Collaborative International Dictionary of English
- n. The outer layer of the blastoderm; epiblast.
- n. The external skin or outer layer of an animal or plant, this being formed in an animal from the epiblast. See Illust. of blastoderm.
from The Century Dictionary and Cyclopedia
- n. The completed outer layer of cells, or outer blastodermic membrane, in all metazoan animals, formed by the cells of the epiblast, and primitively constituting the outer wall of the whole body, as the endoderm does that of the body-cavity; an epiblast, ectoblast, or external blastoderm.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the outer germ layer that develops into skin and nervous tissue
Sorry, no etymologies found.