Plain English Meaning
A panel on the front edge of the wing that swings down and forward to give the wing more lift when the airplane is flying slowly, such as during takeoff and landing.
Full Definition
A type of leading-edge high-lift device that hinges down and forward from the underside of the wing's leading edge to increase wing camber and lift at low airspeeds, typically used during takeoff and landing on jet transport aircraft.
Context Anchor
Seen in airfoil design and high-lift device discussions, especially when comparing different ways a wing can increase lift at low speed.