vit·ri·fy 
(vĭtrə-fī′)
(vĭtrə-fī′)v. vit·ri·fied, vit·ri·fy·ing, vit·ri·fies
v.tr.
To change or make into glass or a glassy substance, especially through heat fusion.
v.intr.
To become vitreous.
[French vitrifier, from Medieval Latin vitrificāre : Latin vitrum, glass + Latin -ficāre, -fy.]
vit′ri·fi′a·bili·ty n.
vitri·fi′a·ble adj.
vit′ri·fi·cation (-fĭ-kāshən) n.