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Noun opal has 1 sense
  1. opal - a translucent mineral consisting of hydrated silica of variable color; some varieties are used as gemstones
    --1 is a kind of     mineral; opaque gem
    --1 has particulars: black opal; fire opal, girasol; harlequin opal
    Derived forms: verb opalize1, verb opalize2
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