1) Alter 2) Become glassy or glass-like 3) Change 4) French word used in English 5) Modify 6) Undergo vitrification 
• (v. t.) To convert into, or cause to resemble, glass or a glassy substance, by heat and fusion. • (v. t.) To become glass; to be converted into glass.
Vit'ri·fy transitive verb [ imperfect & past participle Vitrified ; present participle & verbal noun Vitrifying .] [ French vitrifier ; Latin vitrum glass + - ficare to make. See Vitreous , -fy .] To...
[v] - change into glass or a glass-like substance by applying heat 2. [v] - undergo vitrification
vitrify 1. To convert or change into glass or something like glass. 2. To change or make into glass or a glassy substance; especially, through heat fusion. 3. To make or to become vitreous.
change into glass or a glass-like substance by applying heat