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Aileron
The movable areas of a wingform that control or affect the roll of an aircraft by working opposite one another—up-aileron on the right wing and down-aileron on the left wing. French: aileron small wing, diminutive of aile, from Latin: ala, wing. The word "aisle" also derives from the same root. (Above pic proves that birds invented ailerons long before man did.)
source: FAA Aerosense Glossary
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