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, the early or developing stage of any organism, especially the developing product of fertilisation of an egg after the long axis appears and until all major structures are present, organism oma varaseimas arenemisjärgus, varases arenemisjärgus organism, mille elundite algmed on veel arenemas (inimesel emakasisese arengu 8 esimest nädalat), chez l'humain, produit de la fusion d'un spermatozoïde et d'un ovule, jusqu'à la huitième semaine de son développement dans l'utérus