vitriol

Any of various metal sulphates.

CRYSTALS of Venus or of copper, called also vitriol of Venus, is copper reduced into the form of vitriol by spirit of nitre, or by dissolving verdegris in good distilled vinegar, till the acid be saturated; it is very caustic and used to eat off proud flesh. It is also used by painters, and manufacturers, and sold under the name of distilled vinegar. See CHEMISTRY.

The association of the heavenly bodies with known metals and also with human organs and destinies goes back to ancient Chaldea, the land of astrologers. In Chaucer’s words: ‘The seven bodies eek, lo hear anon. Sol gold is, and Luna silver we declare; Mars yron, Mercurie is quyksilver; Saturnian leed; and Jubitur is tyn, and Venus coper, by my fathers kyn.’ […] Corresponding names were bestowed upon salts of these metals by the alchemists, and some of them have persisted down to the present day. Some examples are lunar caustic (silver nitrate); vitriol of Venus (copper sulphate); sugar of Saturn (lead acetate); and vitriol of Mars, or Martial vitriol (ferrous sulphate).

oil of vitriol (sulfuric acid).

Bitterly abusive language.

For days, online forums sparked with outrage against politicians and race organizers, a tone that turned to vitriol against runners, even from some shaming other runners for being selfish.

To subject to bitter verbal abuse.

To dip in dilute sulfuric acid; to pickle.

To vitriolize.