Embryo

The product of a fertilized egg, from the zygote until the fetal stage.

In humans, the developing organism from the time of fertilization until the end of the eighth week of gestation, when it becomes known as a fetus.

In humans, the developing organism from the time of fertilization until the end of the eighth week of gestation, when it is called a fetus.

Early stage in the development of a plant or an animal. In vertebrate animals (have a backbone or spinal column), this stage lasts from shortly after fertilization until all major body parts appear. In particular, in humans, this stage lasts from about 2 weeks after fertilization until the end of the seventh or eighth week of pregnancy.

An immature organism in the early stages of development. In mammals, develops in the first months in the uterus. In plants, it is the structure that develops in the megagametophyte, as result of the fertilization of an egg cell, or occasionally without fertilization. Somatic embryos can often be induced in in vitro plant cell cultures.