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

1.
jumeau identique, vrai jumeau
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.
Mes cousins sont des jumeaux identiques; il est difficile de les distinguer.
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She gave birth to a pair of healthy identical twins.
Elle a donné naissance à une paire de jumeaux identiques en bonne santé.