From The Collaborative International Dictionary of English v.0.48:

Vitriolic \Vit`ri*ol"ic\, a. [Cf. F. vitriolique.]
   1. (Chem.) Of or pertaining to vitriol; derived from, or
      resembling, vitriol; vitriolous; as, a vitriolic taste.
      Cf. Vitriol.
      [1913 Webster]

   2. Biting, bitter or caustic; having or expressing strong and
      unpleasantly negative feelings; -- of speech or feelings;
      the vitriolic denunciations of opponents by partisan

   Vitriolic acid (Old Chem.),
      (a) sulphuric acid. See Vitriol
      (b) . [Colloq.]
          [1913 Webster]
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