noun Download 🔗Share The membrane of cells that forms the wall of a blastocyst during early pregnancy, providing nutrients to the embryo and later developing into part of the placenta. Examples : ""The trophoblasts, crucial in the early stages of pregnancy, nourish the developing embryo and eventually contribute to the formation of the placenta." " biology medicine anatomy physiology organ human body science biochemistry function Chat with AIVocabulary GamePractice Reading