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

 

gallstone

 noun
noun
BrE BrE//ˈɡɔːlstəʊn//
 
; NAmE NAmE//ˈɡɔːlstoʊn//
 
 
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a hard painful mass that can form in the gall bladder
See the Oxford Advanced American Dictionary entry: gallstone