twin

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Related to diamniotic twins: Dizygotic twins

twin

1. 
a. either of two persons or animals conceived at the same time
b. (as modifier): a twin brother
2. a crystal consisting of two parts each of which has a definite orientation to the other

twin

[′twin]
(biology)
One of two individuals born at the same time.
(crystallography)
References in periodicals archive ?
Monochorionic diamniotic twin pregnancies: natural history and risk stratification.
The protective effect of oligohydramnios in a case of missed diagnosis of spontaneous septostomy in monochorionic diamniotic twins.
Twin-twin transfusion syndrome (TTTS), which is a serious complication in monochorionic diamniotic twins (MCDA-T), involves unequal blood flow via the placental vascular anastomoses from the donor to the recipient twin.