Aileron

[Sarah]

A half gable, as at the end of a penthouse or of the aisle of achurch.

[Sarah]

The control surfaces found on the outboard sections of an airplane's wing. They move up and down and control the roll of the airplane, turning it.
Aileron is from the French for Little

[Rihanna]

A hinged surface in the trailing edge of an aircraft wing, used to control roll around the longitudinal axis.

[PussyCat]

a part along the back edge of an aircrafts wing that can be moved to help the aircraft turn or to keep it level