1. (noun) a not uncommon congenital defect in which a vertebra is malformed; unless several vertebrae are affected or there is myelomeningocele there are few symptoms; can be diagnosed by amniocentesis

• rachischisis
• schistorrhachis

1. (noun) a not uncommon congenital defect in which a vertebra is malformed; unless several vertebrae are affected or there is myelomeningocele there are few symptoms; can be diagnosed by amniocentesis

• birth defect
• congenital abnormality
• congenital anomaly
• congenital defect
• congenital disorder