of or relating to or constituting the vitreous humor of the eye; "the vitreous chamber"
(of ceramics) having the surface made shiny and nonporous by fusing a vitreous solution to it; "glazed pottery"; "glassy porcelain"; "hard vitreous china used for plumbing fixtures"
Vitreous means made of glass or resembling glass. made of or looking like glass (vitreus, from vitrum )