Definition of aileron noun from the Oxford Advanced Learner's Dictionary

 

aileron

 noun
noun
BrE BrE//ˈeɪlərɒn//
 
; NAmE NAmE//ˈeɪlərɑːn//
 
(specialist) Parts of a plane
 
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a part of the wing of a plane that moves up and down to control the plane’s balance See related entries: Parts of a plane Word Origin early 20th cent.: from French, literally ‘small wing’, diminutive of aile, from Latin ala ‘wing’.
See the Oxford Advanced American Dictionary entry: aileron