Etymology
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diatribe (n.)

1640s (in Latin form in English from 1580s), "continued discourse, critical dissertation" (senses now archaic), from French diatribe (15c.) and directly from Latin diatriba "learned discussion," from Greek diatribe "employment, study," in Plato, "discourse," literally "a wearing away (of time), a waste of time," from dia "away" (see dia-) + tribein "to wear, rub," from PIE root *tere- (1) "to rub, turn." For sense evolution, compare school (n.1).

The modern meaning "a strain of invective, a bitter and violent criticism" by 1804, apparently from French.

updated on August 15, 2018

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Definitions of diatribe from WordNet

diatribe (n.)
thunderous verbal attack;
Synonyms: fulmination
From wordnet.princeton.edu, not affiliated with etymonline.