Definition of vitriol
1
: bitterly harsh or caustic language or criticism
political commentators spewing angry vitriol Rumor has always played a role in politics, but rarely have the backstage operatives been so adroit, and so cynical, in their use of vitriol.— Walter Shapiro Cascades of multisyllabic vitriol engulf us as Conrad communicates his utter loathing of television …— Stanley Marcus
2a
: a sulfate of any of various metals (such as copper, iron, or zinc)
especially
: a glassy hydrate of such a sulfate
b
: oil of vitriol
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Merriam-Webster unabridged
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Time Traveler for vitriol
The first known use of vitriol was in the 14th century
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