1. xiphopagus - Noun
2. xiphopagus - Adjective
xiphopagus (not comparable)
(of conjoined twins) United at the xiphoid process.
(countable) Either of a pair of congenitally joined twins (Siamese twin) united at the xiphoid process.
(uncountable) The condition of being such a twin.
Source: en.wiktionary.org