Xiphopagus is a medical term used to describe a condition where two individuals are conjoined at the hip. This condition is rare, and there are very few synonyms used to describe it. However, some of these synonyms include craniopagus, thoracopagus, and omphalopagus. Craniopagus refers to a condition where two individuals share a single head, while thoracopagus refers to a condition where two individuals are joined at the thorax. Omphalopagus, on the other hand, refers to a condition where two individuals are joined from the navel down. Regardless of the specific type of conjoined twins, all require careful medical attention and support to optimize their health and well-being.