Vitriol
Pronunciation : Vit"ri*ol
Part of Speech : n.
Etymology : [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 glass
Source : Webster's Unabridged Dictionary, 1913