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

 

identical twin

 noun
noun
BrE
 
; NAmE
 
(specialist monozygotic twin) Relations
 
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either of two children or animals born from the same mother at the same time who have developed from a single egg. Identical twins are of the same sex and look very similar. compare dizygotic twin, fraternal twin See related entries: Relations
See the Oxford Advanced American Dictionary entry: identical twin