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aileron

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aileron/ˈeɪləˌrɑːn/noun
pluralailerons
aileron
/ˈeɪləˌrɑːn/
noun
pluralailerons
Learner's definition of AILERON  
[count]technical
: a part of an airplane wing that can be moved up or down to cause the airplane to turn
— see picture at airplane
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