Curve with apex between the first and the fourth lumbar vertebrae.
Curve which is formed from the 5 vertebrae found in the lower back; this curve is slightly concave; see lordosis.
a side-to-side curve that occurs in the lumbar, or lower back. More specifically, it is any curve that occurs between the first and fourth lumbar vertebrae.
a spinal curvature whose apex is between the first and fourth lumbar vertebrae (also known as lumbar scoliosis).