The fat and fatty tissues of an animal, especially the harder fat about the kidneys and loins in beef and mutton, which, when melted and freed from the membranes, forms tallow
{i} hard crumbly fat found in the kidneys or loins of cattle and other animals (used in cooking and making tallow)
Suet is hard animal fat that is used in cooking. hard fat from around an animal's kidneys, used in cooking in Britain (From an unrecorded sewet, from sue, from sebum )