Vitrified \Vit"ri*fied\, a. Converted into glass.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Vitrify \Vit"ri*fy\, v. t. [imp. & p. p. Vitrified; p. pr. & vb. n. Vitrifying.]

[F. vitrifier; L. vitrum glass + -ficare to make. See Vitreous, -fy.]

To convert into, or cause to resemble, glass or a glassy substance, by heat and fusion.

Source: Webster's Revised Unabridged Dictionary (1913)