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Adjective: iridescent  ,i-ri'de-sunt
  1. Varying in colour when seen in different lights or from different angles
    "iridescent silk"; "a dragonfly hovered, vibrating and iridescent";
    - changeable, chatoyant, shot
  2. Having a play of lustrous rainbow colours
    "an iridescent oil slick"; "iridescent clouds looking like mother-of-pearl";
    - nacreous, opalescent, opaline, pearlescent

See also: bright, colorful [US], colourful [Brit, Cdn]

Encyclopedia: Iridescent