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English definition of “opal”

opal

noun [C or U]     /ˈəʊ.pəl/ US  /ˈoʊ-/
a precious stone whose colour changes when the position of the person looking at it changes Precious and semi-precious stonesTypes of rock
(Definition of opal noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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