- displaying a play of lustrous colors like those of the rainbow.
- an iridescent cloth, material, or other substance: new fall dresses of imported iridescents.
- displaying a spectrum of colours that shimmer and change due to interference and scattering as the observer’s position changes
adj.1796, literally “rainbow-colored,” coined from comb. form of Latin iris (genitive iridis) “rainbow” (see iris). Related: Iridescently.