What is another word for "lumbar"?

Roget's Thesaurus (1911) lists these synonyms for "lumbar": aback, abaft, aft, after, aitchbone, astern, back, background, backside, backwards, behind, bend, bone, breech, bring, buttock, caudal, chine, coin, croup, crupper, dorsal, dorsum, fall, guard, heelpiece, hind, hinder, hindermost, hindmost, hinterland, loin, mizzen, nape, natch, occiput, other, poop, posterior, posteriority.