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 embryo can be used …

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 week following …

: 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 tiny young plant …

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 to the eighth …

Oct 14, 2025 · An embryo is the early stage of development and lasts from week five to week 10 of pregnancy. A fetus is the later stage of development and lasts from the end of week 10 until birth.

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 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, including the …

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 fertilization, the …

Dec 3, 2025 · Early human embryo cells, once thought to be a blank slate, show abundant differences and potential for success, researchers find.

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 fertilized egg …