[vit.re.ous] adj [L vitreus, fr. vitrum glass] (1646) 1: of, relating to, derived from, or consisting of glass
2. a: resembling glass (as in color, composition, brittleness, or luster): glassy "~ rocks" b: characterized by low porosity and usu. translucence due to the presence of a glassy phase "~ china"
3: of, relating to, or constituting the vitreous humor
[2]vitreous n (1869): vitreous humor