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

 

birthstone

 noun
noun
BrE BrE//ˈbɜːθstəʊn//
 
; NAmE NAmE//ˈbɜːrθstoʊn//
 
 
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a semi-precious stone that is associated with the month of somebody’s birth or their sign of the zodiac
See the Oxford Advanced American Dictionary entry: birthstone