The loin are the sides between the lower ribs and pelvis, and the lower part of the back. It's often used when describing the anatomy of humans and quadrupeds (such as horses, pigs or cattle). The anatomical reference also carries over into the description of cuts of meat from some such animals, eg. tenderloin or sirloin steak. some disorders do contain the term loin. The lumbar region of the spinal column's located in the loin area of the body. As a euphemism for human genitals The term also… (More on Loin)