A germ layer, is a primary layer of cells that form during embryogenesis. The three germ layers in vertebrates are particularly pronounced; however, all eumetazoans, (animals more complex than the sponge) produce two or three primary germ layers. Animals with radial symmetry, like cnidarians, produce two germ layers (the ectoderm and endoderm) mak...
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http://en.wikipedia.org/wiki/Germ_layer
(from the article `gastrula`) An adult, multicellular animal typically possesses a concentric arrangement of tissues of the body. These adult tissues are derived from three ... ...called the embryoblast, since it supplies the materials used in the formation of an embryo. The cellular mass flattens and enters into the process ... ...a...
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http://www.britannica.com/eb/a-z/g/24
Any one of three layers of cells found in a developing tissue. The three layers are the endoderm, mesoderm, and ectoderm, each one giving rise to particular tissues and organs.
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<embryology> A layer of cells produced during the process of gastrulation during the early development of the animal embryo, which is distinct from other such layers of cells, as an early step of cell differentiation. The three types of germ layers are the endoderm, ectoderm, and mesoderm. ... Diploblastic organisms (e.g. Coelenterates) have ...
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http://www.encyclo.co.uk/local/20973
germ cell layer any of the three primary layers of cells formed in the early development of the embryo (ectoderm, endoderm, and mesoderm), from which the organs and tissues develop.
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http://www.encyclo.co.uk/local/21001
In embryology, the germ layer is a layer of cells that can be distinguished during the development of a fertilised egg. Most animals have three such layers: the inner, middle, and outer. These differentiate to form the various body tissues. The inner layer (endoderm) gives rise to the gut, the middle one (mesoderm) develops into most of the other o...
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http://www.probertencyclopaedia.com/browse/EG.HTM
[
n] - (embryology) any of the 3 layers of cells differentiated in embryos following gastrulation
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http://www.webdictionary.co.uk/definition.php?query=germ%20layer
noun (embryology) any of the 3 layers of cells differentiated in embryos following gastrulation
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https://www.encyclo.co.uk/local/20974
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