identical twin
US /aɪˌden.tɪ.kəl ˈtwɪn/
UK /aɪˌden.tɪ.kəl ˈtwɪn/

1.
gemelo idéntico
either of two fetuses or children born at the same birth who have developed from the same ovum and are therefore always of the same sex and usually very similar in appearance
:
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My cousins are identical twins; it's hard to tell them apart.
Mis primos son gemelos idénticos; es difícil distinguirlos.
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She gave birth to a pair of healthy identical twins.
Ella dio a luz a un par de gemelos idénticos sanos.