The long, lean strip of meat along the backbone, boneless and tender; on a menu it usually means pork. Cut into strips for stir-fries, or battered and deep-fried as in sweet and sour pork.
Tenderloin is tender - perfect for sweet-and-sour pork.
Tips
memory
里 (inside) + 脊 (spine) - the strip of muscle running along the inside of the spine, the most tender cut on the animal. The second syllable is toneless (lǐji).