what does a rainbow mean
Rainbow. A rainbow is an optical and meteorological phenomenon that is caused by reflection of light in water droplets in the Earth's atmosphere, resulting in a spectrum of light appearing in the sky.iktionary (5.00 / 1 vote) Rate this definition: rainbow (Noun). A multicoloured arch in the sky, produced by prismatic refraction of light within droplets of rain in the air. rainbow (Noun). Any prismatic refraction of light showing a spectrum of colours. rainbow (Noun).