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embryo

(Encyclopedia) embryo ĕm´brēō, name for the developing young of an animal or plant. In its widest definition, the embryo is the young from the moment of fertilization until it has become structurally…

embryo screening

(Encyclopedia) embryo screening, procedure (see genetic testing) in which a single cell is removed from an embryo two or three days after it has been conceived through in vitro fertilization and…

Brewer's: Embryo

means that which swells inside something (Greek, en-bru'o, which gives the Greek embruon); hence the child in the womb; the rudiment in a plant before it shows itself in a bud; an idea not…

biogenetic law

(Encyclopedia) biogenetic law, in biology, a law stating that the earlier stages of embryos of species advanced in the evolutionary process, such as humans, resemble the embryos of ancestral species…

mesoderm

(Encyclopedia) mesoderm, in biology, middle layer of tissue formed in the gastrula stage of the developing embryo. At the end of the blastula stage, cells of the embryo are arranged in the form of a…

endoderm

(Encyclopedia) endoderm ĕn´dədûrm˝, in biology, inner layer of tissue formed in the gastrula stage of the developing embryo. At the end of the blastula stage, cells of the embryo are arranged in the…

ectoderm

(Encyclopedia) ectoderm, layer of cells that covers the surface of an animal embryo after the process of gastrulation has occurred. This outer layer, together with the endoderm, or inner layer, is…