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

 

diatribe

 noun
noun
BrE BrE//ˈdaɪətraɪb//
 
; NAmE NAmE//ˈdaɪətraɪb//
 
 
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diatribe (against somebody/something) (formal) a long and angry speech or piece of writing attacking and criticizing somebody/something He launched a bitter diatribe against the younger generation. Word Origin late 16th cent. (denoting a long and complicated speech): from French, via Latin from Greek diatribē ‘spending of time, discourse’, from dia ‘through’ + tribein ‘rub’.
See the Oxford Advanced American Dictionary entry: diatribe