vit·re·ous 
(vĭtrē-əs)
(vĭtrē-əs)adj.
1. Of, relating to, resembling, or having the nature of glass; glassy.
2. Obtained or made from glass.
3. Of or relating to the vitreous humor.
n.
The vitreous humor.
[From Latin vitreus, from vitrum, glass.]
vit′re·osi·ty (-ŏsĭ-tē), vitre·ous·ness (-əs-nĭs) n.