Embryo Early stage of development of an organism in the egg or the uterus, during which its essential form and its organs and tissues develop. In humans, the organism is called an embryo for the first seven or eight weeks after conception, after which it is cal... more
Embryo Embryo The developing human organism from the implantation of the fertilized ovum in the uterus, about two weeks after conception to the eighth week after conception. The embryonic period of fetal development is one of rapid growth when the major organ s... more
