rachiopagus

Conjoined twins united back to back with union of their spinal columns. See conjoined twins, under twin. SYN: rachipagus. [rachio- + G. pagos, something fixed]

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ra·chi·op·a·gus (ra″ke-opґə-gəs) [rachio- + pagus] symmetrical conjoined twins united back to back in the sagittal plane, fusion being limited to the upper trunk and cervical region.