Dizygotic refers to twins who develop from separate fertilized eggs and are not genetically identical. There are several synonyms for dizygotic, including fraternal, non-identical, and heterologous twins. Fraternal twins are the most commonly used synonym and refer to twins who develop from two separate eggs, each fertilized by a different sperm cell. This results in two distinct individuals with unique genetic traits. Non-identical twins and heterologous twins are less commonly used synonyms but have the same meaning as dizygotic. These synonyms are important to know in fields such as genetics and obstetrics, where differentiating between identical and non-identical twins is crucial.