noun. The art or operation of turning into glass.

noun. The act orprocess of becoming glass.

noun. The act, art, or process of vitrifying; also, the state of being vitrified.

noun. Alternative form of vitrification.

"Mercury, was given an azure tint by vitrifaction, the whole stage having been subjected to an intense heat after it was erected, whereby the bricks composing it were converted into a mass of blue slag; the seventh stage, that of the moon, was probably, like the fourth, coated with actual plates of metal."