What are girl twins called?

What Are Girl Twins Called?

When people ask what girl twins are called, the answer goes beyond just "twins." If they're two girls born at the same time, they’re most commonly referred to as sororal twins—a term used specifically for female fraternal twins. But here's where it gets interesting: not all twins are the same.

Sororal twins fall under the category of dizygotic, or fraternal, twins. This means they come from two separate eggs fertilized by two different sperm. Genetically, they’re no more alike than regular siblings—just born at the same time. They can look very similar or strikingly different, and yes, they can even have different fathers (though that’s rare).

Unlike identical (monozygotic) twins, who come from a single fertilized egg that splits, fraternal twins like sororal pairs are the result of a double ovulation. This can run in families and is more common in certain populations. The term "sororal" comes from the Latin word *soror*, meaning "sister," which makes it a fittingly warm, human term for girl twins.

Informally, of course, people just say "fraternal twins" or "non-identical twins," but "sororal" adds a bit of precision—especially when distinguishing between twin types. It's worth noting that the male equivalent is "fraternal" (from *frater*, meaning brother), though "sororal" is used less often in everyday conversation.

So, while "girl twins" might sound simple, the science behind them tells a richer story. Whether they share a birthday, a bedroom, or just a last name, sororal twins are a unique blend of chance, biology, and sisterhood.