a blue dye obtained from plants or made synthetically

An arc of spectral colors, usually identified as red, orange, yellow, green, blue, indigo, and violet, that appears in the sky opposite the sun as a result of the refractive dispersion of sunlight in drops of rain or mist, a fainter arch or rainbow, formed by the moon, Any prismatic refraction of light showing a spectrum of colours, adjective_ attributive Made up of several races or ethnicities, or (more broadly) of several cultural or ideological factions, attributive LGBT, Multicoloured

The hue of that portion of the visible spectrum lying between green and indigo, evoked in the human observer by radiant energy with wavelengths of approximately 420 to 490 nanometers; any of a group of colors that may vary in lightness and saturation, whose hue is that of a clear daytime sky; one of the additive or light primaries; one of the psychological primary hues, A pigment or dye imparting this hue