Definify.com

Webster 1913 Edition

Noun.

[Cf.

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

Noun.

[See vitrify.] The act, process or operation of converting into glass by heat; as the vitrifaction of sand, flint and pebbles with alkaline salts.

vitrifaction ‎(uncountable)