Waahoo, an Indian name applied to three different plants. 1. The burning bush. A shrub bearing bright scarlet fruit like that of the bittersweet, to which it is related. The waahoo may be told from the latter by the brighter color of its fruit and the fact that it is a bush, not a vine. The bark is an old-fashioned remedy. 2. The barberry of the Pacific Coast having medicinal properties like those of the bark of the waahoo. 3. The waahoo elm or winged elm. Its branches are ridged with corky wings. The wood is tougher than that of the white elm and is used in the South for hubs.