vitreous (Adjective) — Of or relating to or constituting the vitreous humour of the eye. ex. "the vitreous chamber"
vitreous (Adjective) — Relating to or resembling or derived from or containing glass. ex. "vitreous rocks" ex. "vitreous silica"
vitreous (Adjective) — (of ceramics) having the surface made shiny and nonporous by fusing a vitreous solution to it. ex. "hard vitreous china used for plumbing fixtures"