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opal

noun [C or U]
 
 
/ˈəʊ.pəl/ US  /ˈoʊ-/

Definition

a precious stone whose colour changes when the position of the person looking at it changesPrecious and semi-precious stonesTypes of rock
(Definition of opal noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of opal