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Verb: opalesce  ,ow-pu'les
  1. Reflect light or colours like an opal
    "Distant clouds opalesce like pale brocade"; "raindrops caught in a sunbeam seem to opalesce"
     
  2. Exhibit a play of colours like that of an opal
    "This nitrate opalesces under certain conditions"

Derived forms: opalesces, opalesced, opalescing

Type of: iridesce, reflect, shine