Spline
Part of speech: noun
Definition: A rectangular piece that fits grooves like key seats in a hub and a shaft, so that while the one may slide endwise on the other, both must revolve together. A flexible strip of metal or other material, that may be bent into a curve and used in a similar manner to a ruler to draw smooth curves between points. Any of a number of smooth curves used to join points.
Slat
Part of speech: noun
Definition: A thin, narrow strip or bar of wood or metal; as, the slats of a window blind.(aeronautical) A moveable 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 stall speed in the landing attitude, facilitating slow flight.
Part of speech: verb
Definition: To construct or provide with at least one slat.