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