flaperonn.
/ˈflapərɒn/, U.S. /ˈflæpəˌrɑn/ Aeronautics.
A hinged control surface on the trailing edge of an aircraft wing which combines the functions of a flap and an aileron, controlling both roll about the longitudinal axis and lift.
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1949 J. Teplitz Techn. Rep. in Thirtieth Ann. Rep. National Advisory Comm. Aeron. 1944 467/2 The full-span-flap installation consisted of the double slotted partial-span flaps and ‘flaperons’ or flap-ailerons.
1989 St. Louis (Missouri) Post-Dispatch (Nexis) 18 May d 9 Midcoast will change the test plane to a shuttle trainer, a modification that will require installation of a special wing with flaperons that will vary the amount of lift and drag as required to simulate shuttle descent.
2015 Guardian 1 Aug. 22/4 Definitive confirmation could only come from Boeing, which had made modifications to the flaperon that would make it easy to identify.
This is a new entry (OED Third Edition, January 2018; most recently modified version published online March 2022).
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n.1949