(Bot.) Any plant or flower of the genus Viola, of many species. The violets are generally low, herbaceous plants, and the flowers of many of the species are blue, while others are white or yellow, or of several colors, as the pansy (Viola tricolor). Note: The cultivated sweet violet is Viola odorata of Europe. The common blue violet of the eastern United States is Viola cucullata; the sand, or bird-foot, violet is Viola pedata.