vitriol

Short definition from Wiktionary

Noun

1. 1
   Any of various metal sulphates.
2. 2
   oil of vitriol (sulfuric acid).
3. 3
   Bitterly abusive language.

Verb

1. 1
   To subject to bitter verbal abuse.
2. 2
   To dip in dilute sulfuric acid; to pickle.
3. 3
   To vitriolize.