The loins (or: lumbus) are the sides between the lower ribs and pelvis, and the lower part of the back.[1][2][3] It is often used when describing the anatomy of humans and quadrupeds (such as horses,[4][5] pigs[6][7] or cattle[8]). The anatomical reference also carries over into the description of cuts of meat from some such animals, e.g. tenderloin or sirloin steak.[2]