ai·le·ron 
(ālə-rŏn′)
(ālə-rŏn′)n.
Either of two movable flaps on the wings of an airplane that can be used to control the plane's rolling and banking movements.
[French, diminutive of aile, wing, from Old French, from Latin āla.]
aileronTo bank to the left, a pilot must raise the left aileron and lower the right aileron.
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