A congenital anomaly of the spine caused by incomplete development of one side of a vertebra resulting in a wedge shape 
A congenital defect of the spine in which one side of a vertebra fails to develop completely. ... (05 Mar 2000) ... 
(hem″e-vur´tә-brә) a developmental anomaly in which one side of a vertebra is incompletely developed. Hemivertebra.
Type: Term Pronunciation: hem′ē-ver′tĕ-bră Definitions: 1. A congenital defect of the vertebral column in which one side of a vertebra fails to develop completely due to failure of the chondrification center to form on this side. This produces scoliosis (lateral curvature of the vertebral column).