flap

In medicine, a flap refers to a piece of tissue that is partially detached from its original location but remains connected to a blood supply, allowing it to be moved to cover a defect elsewhere in the body. This technique is particularly useful when both skin and underlying tissues, such as fat or muscle, have been lost. Flaps are thicker than simple skin grafts and can be used to reconstruct areas like a new nose, cover exposed bone, or improve movement in contracted joints, often resulting in good cosmetic outcomes. The term "flap" can also refer to a movable part of an airplane wing that increases lift or drag.12