Frise aileron
[freez]
noun Aeronautics.
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.
Origin of Frise aileron
1930–35; named after Leslie G. Frise (born 1897), British engineer
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Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019