Refers to the back of an animal or the spine.
El lomo de la carne estaba perfectamente sazonado y era muy jugoso.
The loin of the meat was perfectly seasoned and very juicy.
El lomo de cerdo se cocina lentamente para que quede jugoso y tierno al paladar.
The pork loin is cooked slowly so that it remains juicy and tender on the palate.