Definition of wing bar:
(n) :
A band of contrasting color or of feathers with a distinct appearance that crosses a bird's wing.
(n) :
A support strut on for the wing of an airplane.
(n) :
A sand bar or spit at the side of a river, bay, or harbor.
(n) :
One of two shallow bars on either side of the flue of a small boiler, designed to fill the space resulting from the extreme curvature of the flue.