Pronunciation: (vi'trē-ul),[key] —n., v.,-oled, -ol•ing or (esp. Brit.)-olled, -ol•ling.
—n. 1. Chem.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. something highly caustic or severe in effect, as criticism.
—v.t. to treat with or as with vitriol, esp. sulfuric acid.