a bitter, sharply abusive denunciation, attack, or criticism: repeated diatribes against the senator.

1575–85; < Latin diatriba < Greek diatribḗ pastime, study, discourse, derivative of diatríbein to rub away (dia- dia- + tríbein to rub)

tirade, harangue.
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World English Dictionary
diatribe (ˈdaɪəˌtraɪb)
a bitter or violent criticism or attack; denunciation
[C16: from Latin diatriba learned debate, from Greek diatribē discourse, pastime, from diatribein to while away, from dia- + tribein to rub]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1580s, from L. diatriba "learned discussion," from Gk. diatribe "discourse, study," lit. "a wearing away (of time)," from dia- "away" + tribein "to wear, rub," from PIE base *ter- "to rub, turn, twist" (see throw). Sense of "invective" is 1804, apparently from French.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Endless histrionics polemics and diatribes get in the way of the work that must
  be done.
Plenty of libel cases have proceeded against the students that write late night
  diatribes in campus papers.
His diatribes against modern science can make you wonder how he has managed to
  gain so much influence.
These kinds of politically correct pretentious diatribes against behavioral
  genetics float up every several months.
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