rachipagus

rachipagus

 [ra-kip´ah-gus] twin fetuses joined at the vertebral column.

ra·chi·op·a·gus

(rā'kē-op'ă-gŭs), Conjoined twins united back to back with union of their spinal columns. See: conjoined twins. Synonym(s): rachipagus [rachio- + G. pagos, something fixed]