What are twins born with joined organs called?

Until the late 1800s conjoined twins were called “monsters.” The term Siamese twins comes from the twin conjoined brothers Chang and Eng Bunker, who were joined by the liver and born in Siam now Thailand, the first twins to be studied, they with 2 sisters went on to have over 20 children between them.

They're called conjoined.

Outdated term. Question needs to be replaced or reworded.

Faye 💋, why are they being so mean to them the are very rare