Definition: The anterior concavity in the curvature of the lumbar and cervical spine as viewed from the side. The term usually refers to abnormally increased curvature (hollow back, saddle back, swayback). It does not include lordosis as normal mating posture in certain animals (
a type of spinal curvature; disease only; for normal lordosis index under SPINE; for lordosis in animal sex exper use POSTURE + SEXUAL BEHAVIOR, ANIMAL
