noun.an arc or circle that exhibits in concentric bands the colors of the spectrum and that is formed opposite the sun by the refraction and reflection of the sun's rays in raindrops, spray, or mist

• a rainbow of flavors

noun.a multicolored array

noun.a wide assortment or range

adjective.having many colors

• a rainbow coalition

adjective.of, relating to, or being people of different races or cultural backgrounds