A newly developing human is typically referred to as an embryo until the ninth week after conception, when it is then referred to as a fetus. In other multicellular organisms, the word …

An embryo is the early developmental stage of an animal while it is in the egg or within the uterus of the mother. In humans the term is applied to the unborn child until the end of the seventh …

: an animal in the early stages of development that are marked by cleavage, the laying down of the basic tissues, and the formation of primitive organs and organ systems compare fetus. : a …

embryo An organism in its earliest stages of development, especially before it has reached a stage at which it can be distinguished from other species. The human embryo is so called up …

Aug 13, 2023 · An embryo is a newly fertilized egg (zygote) up till the eighth week of development as it transforms through the morula, blastula, gastrula, and organogenesis stages.

Jul 21, 2025 · In humans, the developing organism is referred to as an embryo from the first cell division until about the eighth week after fertilization. The journey of an embryo starts with …

May 21, 2024 · What is an Embryo? An embryo is an organism in the early stages of development which cannot survive on its own. The precise definition of it varies; in humans, for example, a …

Use the stage number links to images and information about each specific stage of human development over the first 8 weeks. The links below give a broad overview of developmental …

Jul 23, 2025 · From weeks three through eight, a developing human is called an embryo, and from the ninth week of gestation until birth, it is called a fetus. The study of embryogenesis, …

An embryo is defined as 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 human pregnancy, the …