vitriol

Etymology

From Middle English vitriol, from Old French vitriol, from Medieval Latin vitriolum (“sulphuric acid”), from vitrum (“glass”).

noun

1. (dated) Any of various metal sulphates.
2. (dated) Oil of vitriol (sulphuric acid).
3. (by extension) 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. November 2 2012, Ken Belson, New York Times, retrieved 2012-11-02

verb

1. (transitive) To subject to bitter verbal abuse.
2. (transitive, metallurgy) To dip in dilute sulphuric acid; to pickle.
3. (transitive, colloquial) To vitriolize.