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

 

brimstone

 noun
noun
BrE BrE//ˈbrɪmstəʊn//
 
; NAmE NAmE//ˈbrɪmstoʊn//
 
(old use)
 
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the chemical element sulphur Word Origin late Old English brynstān, probably from bryne ‘burning’ + stān ‘stone’.
See the Oxford Advanced American Dictionary entry: brimstone