The Collaborative International Dictionary of English v.0.48:

Vitriol \Vit"ri*ol\, v. t. [imp. & p. p. -oledor -olled; p.
   pr. & vb. n. -oling or -olling.] [From Vitriol, n.]
   1. (Metal.) To dip in dilute sulphuric acid; to pickle.
      [Webster 1913 Suppl.]

   2. To vitriolize. [Colloq.]
      [Webster 1913 Suppl.]