vitriol /ˈvɪtɹiəl/noun 3verb 3forms 5 noun3 •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. — 2012 •(old-fashioned) oil of vitriol (sulfuric acid). •(old-fashioned) Any of various metal sulphates. verb3 •To dip in dilute sulfuric acid; to pickle. •To subject to bitter verbal abuse. •(informal) To vitriolize. formsvitrioled · vitriolled · vitrioling · vitriolling · vitriols