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

1.
gêmeo idêntico
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.
Meus primos são gêmeos idênticos; é difícil distingui-los.
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She gave birth to a pair of healthy identical twins.
Ela deu à luz um par de gêmeos idênticos saudáveis.