opalize

Verb
  1. Make opalescent (synset 200117038)
    is a type of: alter, change, modify - cause to change; make different; cause a transformation
    same as: opalise
  2. Replace or convert into opal (synset 200116893)
    "opalized tree trunks"
    is a type of: convert - change the nature, purpose, or function of something
    same as: opalise

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