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vitriol (n.)

late 14c., "sulphate of iron," from Old French vitriol (13c.), from Medieval Latin vitriolum "vitriol," noun use of neuter of vitriolus, variant of Late Latin vitreolus "of glass," from Latin vitreus "of glass, glassy," from vitrum "glass" (see vitreous). So called from its glassy appearance in certain states. Meaning "bitter or caustic feelings" first attested 1769, in reference to the corrosive properties of vitriol (when heated it produces sulfuric acid, formerly called oil of vitriol).

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Definitions of vitriol
1
vitriol (v.)
expose to the effects of vitriol or injure with vitriol;
vitriol (v.)
subject to bitter verbal abuse;
2
vitriol (n.)
(H2SO4) a highly corrosive acid made from sulfur dioxide; widely used in the chemical industry;
Synonyms: oil of vitriol / sulfuric acid / sulphuric acid
vitriol (n.)
abusive or venomous language used to express blame or censure or bitter deep-seated ill will;
Synonyms: vituperation / invective
From wordnet.princeton.edu