a line of contrasting color along the coverts of a bird's wing.
Origin of wing bar
First recorded in 1850–55
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for wing bar
For the latter retains its uniform blackness, while the former gains red on the wing-bar, and saddle and hackle lacing (plate 4).Inheritance of Characteristics in Domestic Fowl|Charles Benedict Davenport