Definition of opal noun from the Oxford Advanced Learner's Dictionary

 

opal

 noun
noun
BrE BrE//ˈəʊpl//
 
; NAmE NAmE//ˈoʊpl//
 
[countable, uncountable] Jewellery
 
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a white or almost clear semi-precious stone in which changes of colour are seen, used in jewellery an opal ring See related entries: Jewellery Word Origin late 16th cent.: from French opale or Latin opalus, probably based on Sanskrit upala ‘precious stone’ (the stone was first brought from India).
See the Oxford Advanced American Dictionary entry: opal