twin

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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 ?
twin pregnancies, monoamniotic twins carry serious risks - including cord entanglement, which can cut off the blood flow from the placenta to the fetus.
At the time of the births, Emma said: "It's been hard when you know so many monoamniotic twins don't make it.
relieved mum Emma Canning with monoamniotic twin Christmas babies Hannah and Sophie.