non-identical twin
noun /ˌnɒn aɪˌdentɪkl ˈtwɪn/
/ˌnɑːn aɪˌdentɪkl ˈtwɪn/
(also fraternal twin, specialist dizygotic twin)
- either of two children or animals born from the same mother at the same time but not from the same egg compare identical twin