wing bar

Short definition from Wiktionary

Noun

1. 1
   A band of contrasting color or of feathers with a distinct appearance that crosses a bird's wing.
2. 2
   A sand bar or spit at the side of a river, bay, or harbor.
3. 3
   A support strut on for the wing of an airplane.
4. 4
   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.