What's the noun for lordotic? Here's the word you're looking for.
lordosis
(pathology) An excessive backwards curvature of the spine, causing a hollow in the back.
(zoology) A bodyposture of some femalemammals, indicating receptivity to copulation. It involves lowering of the forelimbs but with the rear limbs extended and hips raised, ventral arching of the spine and a raising, or sideward displacement, of the tail.