Blastodisc is a term used in embryology to describe a flattened disc of cells found at the top of the yolk in the early stages of embryonic development. This structure later becomes the embryo. Though blastodisc is the most common term used in the field of embryology, there are other synonymous terms that are often employed. These include germinal disc, blastula stage, embryonic disk, embryonic shield, germinal area, and embryonic diskblast. Since the term blastodisc plays an essential role in embryology, it is vital for embryologists and other scientists involved in research related to embryonic development to be familiar with these synonyms.