vitriol

vit⋅ri⋅ol
  /ˈvɪtriəl/ Show Spelled Pronunciation [vi-tree-uhl] Show IPA noun, verb, -oled, -ol⋅ing or (especially British) -olled, -ol⋅ling.
Use vitriol in a Sentence
–noun
1. Chemistry. 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.
–verb (used with object)
4. to treat with or as with vitriol, esp. sulfuric acid.
Origin:
1350–1400; ME < ML vitriolum, vitreolum, equiv. to L vitre(us

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