vitrifaction

Noun

vitrification (countable and uncountable, plural vitrifications)

1. (uncountable, usually) Turning to glass or glasslike material: the action or process of vitrifying a material: conversion into an amorphous solid free of any crystalline structure by addition or removal of heat or by mixture with an additive.
   • At this point overfiring begins, as is shown particularly by the volume curve, which indicates decided bloating, so that at 1450°C the clay has about the same volume it had at 1050°C before vitrification took place.1919, United States. Bureau of Standards, Technologic Papers of the Bureau of Standards, Washington, D.C.: United States Government Printing Office, page 15
2. (countable) An instance of such conversion.
3. (countable) The result of such conversion: a vitrified substance or object.