\Vit"ri*ol\, v. t. [imp. & p. p. {-oled}or {-olled}; p.
pr. & vb. n. {-oling} or {-olling}.] [From {Vitriol}, n.]
1. (Metal.) To dip in dilute sulphuric acid; to pickle.
2. To vitriolize. [Colloq.]

\Vit"ri*ol\, n. [F. vitriol; cf. Pr. vitriol, vetriol,
Sp. & Pg. vitriolo, It. vitriuolo; fr. L. vitreolus of glass,
vitreus vitreous. See {Vitreous}.] (Chem.)
(a) A sulphate of any one of certain metals, as copper, iron,
    zinc, cobalt. So called on account of the glassy
    appearance or luster.
(b) Sulphuric acid; -- called also {oil of vitriol}. So
    called because first made by the distillation of green
    vitriol. See {Sulphuric acid}, under {Sulphuric}.
    [Colloq.]
{Blue vitriol}. See under {Blue}.
{Green vitriol}, ferrous sulphate; copperas. See under
   {Green}.
{Oil of vitriol}, sulphuric or vitriolic acid; -- popularly
   so called because it has the consistency of oil.
{Red vitriol}, a native sulphate of cobalt.
{Vitriol of Mars}, ferric sulphate, a white crystalline
   substance which dissolves in water, forming a red
   solution.
{White vitriol}, zinc sulphate, a white crystalline substance
   used in medicine and in dyeing. It is usually obtained by
   dissolving zinc in sulphuric acid, or by roasting and
   oxidizing certain zinc ores. Formerly called also {vitriol
   of zinc}.