nacreous

Adjective
  1. Consisting of or resembling mother-of-pearl (synset 303007631)
  2. Having a play of lustrous rainbow colors (synset 300282886)
    "an iridescent oil slick"; "nacreous (or pearlescent) clouds looking like mother-of-pearl"; "a milky opalescent (or opaline) luster"
    similar to: bright - emitting or reflecting light readily or in large amounts
    same as: iridescent, opalescent, opaline, pearlescent

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