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The Collaborative International Dictionary of English v.0.48:

Devitrification \De*vit`ri*fi*ca"tion\, n. The act or process of devitrifying, or the state of being devitrified. Specifically, the conversion of molten glassy matter into a stony mass by slow cooling, the result being the formation of crystallites, microbites, etc., in the glassy base, which are then called devitrification products. [1913 Webster]