germ layer
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germ 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,… … Medical dictionary
germ 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 … English World dictionary
Germ 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… … Wikipedia
germ layer — germ′ lay er n. dvl any of the three primary embryonic cell layers Compare ectoderm,endoderm,mesoderm • Etymology: 1875–80 … From formal English to slang
germ 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 … The new mediacal dictionary
germ layer theory — the theory that the embryo develops three primary germ layers, each of which gives rise to definite organ derivatives … Medical dictionary
germ layer — noun Date: 1877 any of the three primary layers of cells differentiated in most embryos during and immediately following gastrulation … New Collegiate Dictionary
germ layer — see germinal layers … Dictionary of invertebrate zoology
germ layer — noun Embryology each of the three layers of cells (ectoderm, mesoderm, and endoderm) that are formed in the early embryo … English new terms dictionary
germ layer — /ˈdʒɜm leɪə/ (say jerm layuh) noun one of the three primary embryonic cell layers, i.e., ectoderm, endoderm, and mesoderm …
