craniorachischisis

noun
cra·​nio·​ra·​chis·​chi·​sis | \ ˌkrā-nē-(ˌ)ō-rə-ˈkis-kə-səs How to pronounce craniorachischisis (audio) \
plural craniorachischises\ -​ˌsēz How to pronounce craniorachischises (audio) \

Medical Definition of craniorachischisis

: a congenital fissure of the skull and spine