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
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non-identical twin