di·a·tribe

[dahy-uh-trahyb]
noun
a bitter, sharply abusive denunciation, attack, or criticism: repeated diatribes against the senator.

Origin:
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) [Click for IPA pronunciation guide]
 
n
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]

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00:10
Diatribe is a GRE word you need to know.
So is sanction. Does it mean:
a method of closing a debate and causing an immediate vote to be taken on the question.
authoritative permission that serves to support an action or condition
Etymonline
Word Origin & History

diatribe
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
It included pictures of him posing with guns, video clips and a rambling and
  obscene diatribe against wealthy people.
This diatribe is so unrelentingly negative that it loses all power to persuade.
Now, let's calm down and analyze your diatribe.
Disappointingly absent of journalistic distance, this diatribe fails to provide
  constructive suggestions for change.
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