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 ?
This interdependency is fundamentally different from the less-entwined relationship of dichorionic twins, and makes monitoring more complicated and all the more important.
Dichorionic twins were followed at 12, 18, 24, 30, and 34 weeks; monochorionic twins were followed every 2 weeks from 20 weeks.
Physicians should spend some time assessing the thickness of the membrane, the lambda sign, and gender discord to differentiate between monochorionic and dichorionic twins.