Meaning of Frise aileron

Frise' ai"leron

Pronunciation: (frēz), [key]
— Aeron. Aeron.
  1. an aircraft wing control surface designed with its leading edge extending forward of its axis of rotation so that when the aileron's trailing edge is raised the leading edge extends below the bottom surface of the wing.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.