Definition of fraternal twin noun from the Oxford Advanced Learner's Dictionary

 

fraternal twin

 noun
noun
BrE
 
; NAmE
 
(also non-identical twin, specialist dizygotic twin)
 
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either of two children or animals born from the same mother at the same time but not from the same egg compare identical twin, monozygotic twin
See the Oxford Advanced American Dictionary entry: fraternal twin