vitriol
/ˈvɪtrɪəl; `vɪtrɪəl/ n[U]
1 (dated 旧) sulphuric acid or any of its salts 硫酸; 硫酸盐; 矾
blue vitriol,ie copper sulphate 胆矾（五水硫酸铜）.
2 (fig 比喻) savagely hostile comments or criticism 深怀敌意的评语或批评
His attack on the government was pure vitriol. 他纯粹出於恶意抨击政府.