rachischisis

from The Century Dictionary.

• noun The preferable spelling of rhachischisis.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A developmental birth defect in which the neural tube fails to close completely, leading to motor and sensory deficits, chronic infections, and disturbances in bladder function.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• 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