dizygotic twin [ˌdaɪzaɪˌɡɒtɪk ˈtwɪn; NAmE ˌdaɪzaɪˌɡɑːtɪk ˈtwɪn] (also dizygous twin [daɪˌzaɪɡəs ˈtwɪn]) adj (technical) = fraternal twin