What's the noun for slat? Here's the word you're looking for.
slat
A thin, narrow strip or bar of wood (lath) or metal.
(aeronautical) A movable control surface at the leading edge of a wing that when moved, changes the chord line of the airfoil, affecting the angle of attack. Employed in conjunction with flaps to allow for a lower stallspeed in the landing attitude, facilitating slow flight.