vitriol, vitrioled, vitriolled, vitrioling, vitriolling, vitriols 1. Any of certain metallic sulfates of glassy appearance, as copper sulfate or blue vitriol, iron sulfate or green vitriol, zinc sulfate or white vitriol, etc. 2. Oil of vitriol; sulfuric acid. 3. A highly corrosive acid made from sulfur dioxide; widely used in the chemical indust...