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

 

topaz

 noun
noun
BrE BrE//ˈtəʊpæz//
 
; NAmE NAmE//ˈtoʊpæz//
 
[countable, uncountable]
 
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a clear yellow semi-precious stone a topaz ring Word Origin Middle English (denoting a yellow sapphire): from Old French topace, via Latin from Greek topazos.
See the Oxford Advanced American Dictionary entry: topaz