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diatribe-noun /ˈdaɪəˌtraɪb/ Pronunciation Key - Show Spelled Pronunciation[dahy-uh-trahyb]
a bitter, sharply abusive denunciation, attack, or criticism: repeated diatribes against the senator.

http://dictionary.reference.com/browse/diatribe

She longed to throw a sharp diatribe at him, but knowing how angry he got at the slightest criticism, she didn't say anything to avoid making a scene.