definition of lumbar lordosis
lumbar lordosis. the normal, anteriorly convex curvature of the lumbar segment of the vertebral column; lumbar lordosis is a secondary curvature of the vertebral column, acquired postnatally as the upright posture is assumed when one learns to walk.Synonym(s): lordosis lumbalis [TA], lumbar flexure.umbar lordosis, the dorsally concave curvature of the lumbar spinal column when seen from the side. Also called lumbar curvature.