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).
- Any of various low-growing herbs of the genus Viola, having short-spurred, irregular flowers that are characteristically purplish-blue but sometimes yellow or white.
- Any of several similar plants, such as the African violet.
- The hue of the short-wave end of the visible spectrum, evoked in the human observer by radiant energy with wavelengths of approximately 380 to 420 nanometers; any of a group of colors, reddish-blue in hue, that may vary in lightness and saturation.