Vitrify

VIT'RIFY, verb transitive [Latin vitrum, glass, and facio, to make.]

To convert into glass by fusion or the action of heat; as, to vitrify sand and alkaline salts.

VIT'RIFY, verb intransitive To become glass; to be converted into glass.

Chimists make vessels of animal substances calcined, which will not vitrify in the fire.