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

 

vitriol

 noun
noun
BrE BrE//ˈvɪtriəl//
 
; NAmE NAmE//ˈvɪtriəl//
 
[uncountable](formal)
 
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very cruel and bitter comments or criticism synonym abuse Word Origin late Middle English (denoting the sulphate of various metals): from Old French, or from medieval Latin vitriolum, from Latin vitrum ‘glass’.
See the Oxford Advanced American Dictionary entry: vitriol