The sirloin steak is a steak cut from the back of the animal.
In U.S. butchery, the steak is cut from the rear back portion of the animal, continuing off the short loin from which T-bone, porterhouse, and club steaks are cut. The sirloin is actually divided into several types of steak. The top sirloin is the most prized of these and is specifically marked for sale under that name. The bottom sirloin, which is less tender and much larger, is typically marked for sale simply as "sirloin steak". The bottom sirloin in turn connects to the sirloin tip roast.
In British, South African and Australian butchery, the word sirloin refers to cuts of meat from the upper middle of the animal, similar to the American short loin, while the American sirloin is called the rump. Because of this difference in terminology, in these countries, the T-bone steak is regarded as a cut of the sirloin.
The word sirloin derives from from the Middle Englishsurloine, itself derived from the Old French word surloigne (variant of surlonge), that is, sur for 'above' and longe for 'loin'. In Modern French, the cut of meat is called aloyau or faux-filet.