germ layer
1germ layer — n any of the three primary layers of cells differentiated in most embryos during and immediately following gastrulation * * * any of the three distinct types of tissue found in the very early stages of embryonic development (see ectoderm,… …
2germ layer — n. Embryology any of the three primary layers of cells (ectoderm, endoderm, and mesoderm) from which the various organs and parts of the organism develop by further differentiation …
3Germ layer — [ http://www.ncbi.nih.gov/About/primer/genetics cell.html NCBI] .] A germ layer is a collection of cells, formed during animal embryogenesis. Germ layers are particularly pronounced in the vertebrates; however, all animals more complex than… …
4germ layer — germ′ lay er n. dvl any of the three primary embryonic cell layers Compare ectoderm,endoderm,mesoderm • Etymology: 1875–80 …
5germ layer — any of the three distinct types of tissue found in the very early stages of embryonic development (see ectoderm, endoderm, mesoderm). The germ layers can be traced throughout embryonic development as they differentiate to form the entire range of …
6germ layer theory — the theory that the embryo develops three primary germ layers, each of which gives rise to definite organ derivatives …
7germ layer — noun Date: 1877 any of the three primary layers of cells differentiated in most embryos during and immediately following gastrulation …
8germ layer — see germinal layers …
9germ layer — one of the three primary embryonic cell layers. Cf. ectoderm, endoderm, mesoderm. [1875 80] * * * …
10germ layer — noun Embryology each of the three layers of cells (ectoderm, mesoderm, and endoderm) that are formed in the early embryo …
