Siamese twin
conjoined twin

Siamese twins separated in a 22-hour operation two and a half months ago have a potentially serious vision problem, doctors said today.

We're Siamese twins now and should be honest with each other.

Most Siamese twins die at or shortly after birth.

There are even Siamese twins, created by two of the women wearing a single wide child's dress.

As for me, I didn't want to pressure anyone into being Siamese twins with a sibling.

We're not Siamese twins, I do have a life of my own.

When I cut out the aggression much of the sexuality goes too, they're Siamese twins.

But we can't be Siamese twins, touching all the time.

The joker brothers were Siamese twins, of a sort.

Except for that, they could be Siamese twins.