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This term appears in a blason, describing a coat-of-arms that is said to have 'trois demi-vols' --- the picture clearly shows three things that COULD be feathers, or foxes brushes (logical, in view of the place it belongs to)
I'm assuming that the singular is demi-vol, and I guess the 'demi-' part is crucial; I even wondered about 'half-voles'!