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 ?
In our dataset, the prospective risk of foetal demise was two to three times higher in the monochorionic twins when compared with dichorionic twins.
Perinatal outcome was poor in monochorionic twins as compared to dichorionic twins.
The other outcomes differ between monochorionic and dichorionic twins because the splitting of an egg can be imperfect: monochorionic twins share "plumbing" and vascular connections, and they have to share the resources of one placenta, Dr.
Presumptions about zygosity are based on chorionicity: Almost all (90%) dichorionic twins are dizygotic and all monochorionic twins are monozygotic.
Lopriore et all (2008) (18) studied that perinatal mortality was 2% (3/148) in monochorionic twins and 0% (0/766) in dichorionic twins (P = 0.
There are only monochorionic twins or dichorionic twins.
A distinction between monochorionic and dichorionic twins must be made.
We must distinguish between monochorionic and dichorionic twins.