vitreous /ˈvɪtriəs/adjective 6noun 1forms 3 adjective6 •Of or resembling glass; glassy. •Having a shiny nonporous surface. •With a glass-like texture, often referring to volcanic rocks that cooled too quickly for crystals to form. •Of or relating to the vitreous humor of the eye. •Of a semi-crystalline substance where the atoms exhibit short-range order, but without the long-range order of a crystal. •(old-fashioned) Positive (of electric charge). noun1 •The vitreous humor. formsvitreouses · more vitreous · most vitreous