Aileron
Aileron : The movable areas of a wing form 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)
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